Polyaspartic and Polyurea Floor Coatings

A polyaspartic floor coating is a two-component aliphatic polyurea, made from a polyaspartic ester amine and an aliphatic polyisocyanate, that is rolled onto concrete at 70 to 100 % solids and cures in hours rather than days. On floors, "polyurea floor coating" and the US garage-trade word "poly" name the same chemistry. Sherwin-Williams General Polymers 4850 Polyaspartic SS (GP4850, data sheet 2018) takes foot traffic 6 hours and wheels 24 hours after application at 25 °C (77 °F) with a 254 µm (10 mil) wet film.

No EN or ASTM product standard covers the class, so a specification rests on test methods such as ASTM D4060-25 abrasion and D7234-22 pull-off on concrete, on EN 13813:2002 where a product is declared as synthetic resin screed material, and on dated VOC and isocyanate rules. Polyaspartic coatings are one resin floor class within the wider family of construction chemicals.

This page follows a specification in order: identity, cure chemistry, uses, properties, standards, selection, application by temperature, inspection, safety and VOC, alternatives and sourcing.

How we check: standards, codes and rules are read at the body that issues them, product values come from the data sheet named in the text, and each price carries its own source and date; the full method is in methodology and fact-checking.

The summary table below lists the eight attributes a specifier checks first on a polyaspartic floor coating.

What Is a Polyaspartic Floor Coating?#

Polyaspartic floor coatings are the roller-applied branch of polyurea chemistry: the hindered polyaspartic ester slows the amine-isocyanate reaction enough to roll a 381 µm (15 mil) wet coat, and the aliphatic backbone resists yellowing. The chemistry is a slowed polyurea developed by Covestro, then Bayer MaterialScience, in the early 1990s, according to a 2016 technology review published in PCI magazine. Why does a slower reaction matter? The hindered ester leaves a working window measured in minutes, long enough to roll a coat and keep a wet edge.

Polyaspartic is one of five resin chemistries used on concrete floors, next to epoxy, polyurethane, polyurethane cement (PU-cement) and methyl methacrylate (MMA). All five cure by chemical reaction in situ and share the substrate, moisture and dew-point rules of resin and industrial floor coatings.

Polyaspartic, polyurea and "poly": which names mean which chemistry?#

On floors, "polyurea" and "poly" are trade names for polyaspartic coatings, while pure and hybrid polyureas are spray-applied membranes that gel in seconds. Pure polyurea is the reaction product of an isocyanate and an amine, a hybrid adds a polyol to the amine blend, and polyaspartic is an aliphatic polyurea built on an aspartic ester. Polyaspartic acid (sodium polyaspartate, CAS 25608-40-6) is an unrelated scale inhibitor used in water treatment. The table below maps four names to their chemistry and to the page that covers each.

The two components: aliphatic polyisocyanate and polyaspartic ester#

Part A is a polyaspartic ester amine and Part B an aliphatic polyisocyanate, such as an HDI oligomer or the HDI isocyanurate trimer. Hexamethylene diisocyanate (HDI) monomer is CAS 822-06-0 (EC 212-485-8), HDI oligomers are CAS 28182-81-2 (EC 500-060-2, an NLP number) and the discrete HDI isocyanurate is CAS 3779-63-3 (EC 223-242-0). The free monomer content of the hardener decides the safety rules further down.

Aliphatic isocyanates explain the color stability of the film. Aromatic isocyanates, such as MDI and TDI, are more reactive but yellow in light, while aliphatic ones, such as HDI, IPDI and H12MDI, are used for lightfast topcoats. One hardener raw material for the polyaspartic side, Desmodur E 2863 XP, declares an NCO content of 11.0 %, and the chemistry of these building blocks is covered under polyurethane resins and prepolymers.

How Does a Polyaspartic Coating Cure So Fast?#

A polyaspartic coating cures by the urea reaction between amine and isocyanate groups, and the steric hindrance of the aspartic ester slows that reaction from seconds to minutes, so the mix can be rolled before it gels. Touch-dry follows in 1 to 4 hours according to the 2016 PCI technology review, against 6 to 12 hours dry-to-touch for a two-component aliphatic polyurethane.

Cold slows the reaction without stopping it. The same review notes that polyaspartic coatings can be applied below 10 °C (50 °F), and on one data sheet (GP4850) touch-dry doubles from 1 hour at 25 °C (77 °F) to 2 hours at 1.7 °C (35 °F). The price of fast cure is a short pot life, which leaves lap lines and roller marks wherever the wet edge is lost.

Where Are Polyaspartic and Polyurea Floor Coatings Used?#

Polyaspartic and polyurea floor coatings are used on concrete where fast return to service and UV color stability matter: garage floors, decorative flake and quartz systems, clear topcoats over epoxy, and exterior slabs. The five use groups below each lead to the page that covers the system in full.

• Garage floors, where an epoxy basecoat, a flake broadcast and a polyaspartic topcoat, or a full polyaspartic system, form the garage floor coatings compared for residential use.
• Decorative flake, metallic and quartz floors, where clear polyaspartic or aliphatic polyurethane topcoats protect epoxy basecoats in decorative resin floors.
• Topcoats over epoxy flooring, where the epoxy base gives adhesion and build and the polyaspartic coat gives UV stability.
• Full polyaspartic systems on bare concrete ground to concrete surface profile CSP 3, where a one-day return to service is required.
• Exterior concrete exposed to sunlight, where an aliphatic film keeps its color while an epoxy film yellows.

Which Properties Define Polyaspartic Floor Performance?#

Five properties describe a polyaspartic floor coating on its data sheet (adhesion, tensile strength and elongation, hardness, abrasion and impact), and none of them has a class threshold in a standard. The table below lists the five values of one product with the test method as its data sheet cites it.

Values of one product, named in the table; no standard sets a minimum for any of the five properties.

UV and hot-tire resistance appear in maker literature as statements, not test results: a Tnemec technical resource describes epoxies as never truly UV stable and polyaspartics as low-yellowing.

Standard requirement or product value: reading a polyaspartic data sheet#

A data-sheet value is what one product reached in one test; without a product standard there is no minimum to read it against. The 80 mg Taber loss in the table cannot be ranked against another coating unless the wheel, the load and the cycle count match, and the data sheet states neither wheel nor load. ASTM D4060-25 is the current Taber edition.

Hardness compares only on one durometer scale: Shore D 69 for GP4850 sits against about 76 for the epoxy Sikafloor-264 N. The adhesion value of 2.9 MPa (425 psi) was pulled over an epoxy primer, not on bare concrete, so it describes the primer bond as much as the polyaspartic coat. Two printing errors on the same sheet ("D 2040" for the hardness method, "80 m/g" for the abrasion unit) read as ASTM D2240 and 80 mg.

Which Standards and Test Methods Apply to Polyaspartic Floors in the EU and US?#

No EN or ASTM product standard classifies polyaspartic floor coatings, so EU declarations use EN 13813:2002 synthetic resin (SR) screed material and US data sheets report ASTM test methods. EN 13813:2002 is the current harmonised standard for screed material (cited in OJ C 259 of 2014-08-08), and CE marking for SR starts at bond class B1,5, impact class IR4 and wear class AR1 or RWA10. The table below lists each document by region with its scope.

A declaration of performance under EN 13813:2002 carries a designation such as SR-B2,0-AR1-IR4, with comma decimals as printed. How the classes are tested and declared is covered under EN 13813 screed materials and floor screeds.

Is there an EN or ASTM product class for polyaspartic coatings?#

No: polyaspartic coatings have no class of their own in EN or ASTM documents, so specifications describe them by build, test results and FeRFA thickness type. FeRFA, the UK resin flooring association, sorts resin floors into eight thickness types, and a polyaspartic coat falls into Type 1 (seal, up to 150 µm), Type 2 (coating, 150 to 300 µm) or Type 3 (high-build, 300 to 1,000 µm). Where a supplier declares a polyaspartic system to EN 13813:2002, the SR CE threshold above is the minimum declaration it has to meet.

How do you check a polyaspartic data sheet or declaration?#

Five checks, listed below in reading order, turn a brand question into a document check.

1. Read the test method and edition behind every value, and for adhesion to concrete expect ASTM D7234-22, the method of pull-off adhesion testing for coatings on concrete, rather than D4541, which covers coatings on metal.
2. Read the film thickness and the temperature behind every pot life, touch-dry and traffic time.
3. Check the volume solids and whether each coverage figure is stated per wet or per dry film.
4. Read section 3 of the SDS for monomeric diisocyanate content, and for EU supply look for the entry 74 training statement on the label.
5. Read the declaration of performance for an EN 13813:2002 SR designation where the product is sold in the EU as screed material.

How Do You Choose a Polyaspartic Floor System?#

Choose a polyaspartic system by what the floor must survive and how fast it must return to service: one-day turnaround and UV exposure favor polyaspartic, while thick builds, kitchens and damp slabs call for another resin or a barrier. The table below matches six site situations to a system and to the value behind the choice.

Polyaspartic topcoat over epoxy or a full polyaspartic system?#

A polyaspartic floor is built either as a hybrid, with an epoxy base coat for adhesion and build under a polyaspartic or polyurea topcoat for UV stability, or as a full polyaspartic system on prepared concrete. The hybrid is the build a Tnemec technical resource describes for floors that need both thickness and UV resistance, and decorative flake, metallic and quartz floors use it with clear topcoats.

A full polyaspartic system on the GP4850 data sheet goes onto concrete ground to CSP 3, with abrading at 60 to 80 grit where the coat goes over its epoxy primer and at 36 grit where it goes over an existing resin floor. Epoxy builds run from a 0.3 mm roller coat to 3 to 4 mm broadcast systems, against 381 µm (15 mils) wet for one polyaspartic coat.

When is a polyaspartic coating the wrong product?#

Four situations, listed below with the class that serves each, call for another product class.

• Damp slabs on grade without a vapor or moisture barrier, which need moisture mitigation systems for concrete slabs before any coating.
• Cracked slabs and open joints, which are repaired first under concrete floor and slab crack repair.
• Food production and commercial kitchen floors and builds of 6 mm or more, which call for polyurethane cement floors.
• Waterproofing duty on roofs, decks and tanks, which belongs to spray-applied polyurea membranes rather than a rolled floor coat.

How Is a Polyaspartic Floor Applied? Preparation, Film, Coverage and Cure#

A polyaspartic floor is decided in its first hour, by the short pot life, the slab moisture and the dew-point margin, so the application section of a specification fixes profile, moisture, film per coat and temperature.

Surface preparation and slab moisture#

Polyaspartic coatings go on mechanically prepared concrete: GP4850 calls for a concrete surface profile of CSP 3 to ICRI 310.2R-2013, and acid etching is not used. ICRI 310.2R-2013 grades profiles from CSP 1 to CSP 10 against replica chips, and a specification states a CSP range, explained in full under concrete surface profile (CSP 1 to 10). Grinding dust falls under OSHA 29 CFR 1926.1153, whose Table 1 entry (xiii) lists floor grinders with integrated water delivery or a dust collector of at least 99 % filter efficiency.

FeRFA guidance for resin floors asks for concrete of at least strength class RC30 (BS 8500-2), a pull-off strength above 1.5 N/mm² (218 psi) or a rebound hammer value above 25, and a surface RH of at most 75 % (BS 8203, as cited) unless the product is moisture tolerant. Three checks follow.

• Measure slab moisture by concrete moisture testing to ASTM F2170-19a (in-situ RH) or F1869-23 (calcium chloride); neither method sets a pass/fail value, so the limit is the coating maker's.
• Install a two-component membrane to ASTM F3010-24, at most 0.10 perm by ASTM E96 Procedure B with a tensile bond of at least 1.38 MPa (200 psi) and failure in the concrete, where moisture exceeds that limit; the products are compared under moisture mitigation systems for concrete slabs.
• Remove laitance by blasting, planing or grinding, since FeRFA guidance does not recommend acid etching for resin floors and acid-etched garage floors are a known peeling case.

Film thickness per coat: wet vs dry, and coverage per liter and gallon#

A polyaspartic coat goes on at up to 381 µm (15 mils) wet per coat, and the dry film equals the wet film times the volume solids. Which basis does a coverage figure use? The thin-film identity answers it: 1,604 ft² per US gallon at 1 mil DFT and 100 % volume solids, or in metric m²/L = 1,000 × volume solids / DFT in µm.

Worked example, inputs labelled: wet film 254 µm (10 mils) and volume solids 94 %. The dry film is 254 × 0.94 = 239 µm (9.4 mils), and the theoretical coverage per coat is 1,000 × 0.94 / 239 = 3.94 m²/L, the same as 1,604 / 10 = 160 ft²/gal on the wet basis, with no loss. The table below gives the same arithmetic for three wet films at the volume solids of the product named in its header.

Theoretical coverage per coat on the wet basis with no loss; the A01 grade of the named product is limited to 254 µm (10 mils) WFT.

Practical coverage on a profiled slab is lower than the theoretical figure, so a quantity calculation states its basis per coat, as the coating coverage calculator does.

Application temperature, humidity and dew point#

The application window of a polyaspartic coat is set by its data sheet and checked against two reference practices: ISO 8502-4:2017 for the dew point and FeRFA guidance for resin floors.

Worked example to ISO 8502-4:2017, inputs labelled: air at 20 °C (68 °F) and 50 % RH give a dew point of 9.3 °C (48.7 °F), so the minimum surface temperature is 9.3 + 3 = 12.3 °C (54.1 °F). A slab can sit 10 °C (18 °F) colder than the air, according to FeRFA guidance, so the air reading alone never clears the margin. US data sheets round the margin to 5 °F (2.8 °C), while the ISO margin is 3 °C (5.4 °F).

Pot life, recoat and return-to-service times by temperature#

At 25 °C (77 °F) and a 254 µm (10 mil) wet film, GP4850 gives 20 to 25 minutes of pot life, is touch-dry in 1 hour and takes foot traffic after 6 hours and wheels after 24 hours. At 1.7 °C (35 °F) the same film needs 2 hours to touch-dry, and the working time drops to 15 minutes. The recoat window of 6 to 36 hours at 25 °C (77 °F) is the second limit: a coat outside it is abraded before the next one goes on, or the intercoat bond fails.

Full cure is not stated on the data sheet, and the cold row gives no recoat or traffic times.

How Are Polyaspartic Floors Inspected, and Why Do They Fail?#

Polyaspartic floors fail in four recurring ways (lap lines, delamination over damp slabs, tire staining and intercoat peeling), and three checks catch them: wet-film readings, pull-off tests and abrasion data.

The table below pairs each failure with its cause and its check.

Pull-off results on a polyaspartic floor are read with ASTM D7234-22, the method for coatings on concrete, and the failure mode is reported with every value. FeRFA guidance treats more than 1.5 N/mm² (218 psi) to BS EN 13892-8:2002 as satisfactory, as guidance rather than an EN 13813 requirement, and the methods are set side by side under pull-off adhesion testing.

What Health, Safety and VOC Rules Apply to Polyaspartic Coatings?#

The hardener side of a polyaspartic coating carries the hazard: diisocyanates are respiratory and skin sensitizers, and EU use needs REACH Annex XVII entry 74 training when diisocyanates reach 0.1 % by weight. The table below collects the classification, rule and limit lines with their instrument and date.

Isocyanate hazards and REACH Annex XVII entry 74 training#

HDI monomer (CAS 822-06-0) has a harmonised CLP Annex VI entry, index 615-011-00-1, while HDI oligomers (CAS 28182-81-2) have none, so a hardener's classification is read on its SDS. The monomer entry lists H331, H335, H315, H319, H334 and H317.

Entry 74 of REACH Annex XVII, added by Regulation (EU) 2020/1149, has required documented training before industrial or professional use since 2023-08-24 for products with diisocyanates at 0.1 % by weight or more, individually and in combination, renewed at least every five years. Since 2022-02-24 the pack carries the statement "As from 24 August 2023 adequate training is required before industrial or professional use", and the entry is retained in UK REACH. Residual monomer is what counts: low-monomer hardener grades below 0.1 % fall outside the entry, while the standard hardener Desmodur N 3300 declares HDI up to 0.15 % and falls inside it, so section 3 of the SDS decides, not the brand. Entry 74 does not apply to the epoxy-amine primer under a hybrid build, and training levels by task are set out under diisocyanates rules.

Exposure limits for HDI in the EU and US#

The EU binding limit for all diisocyanates is 6 µg NCO/m³ over 8 hours and 12 µg NCO/m³ short-term under Directive (EU) 2024/869, with transitional values of 10 and 20 µg NCO/m³ until 2028-12-31. Transposition was due by 2026-04-09. In the US, OSHA sets no PEL for HDI, and NIOSH recommends a REL of 0.005 ppm (0.035 mg/m³) as a time-weighted average with a 10-minute ceiling of 0.020 ppm (0.140 mg/m³). Spraying an aliphatic topcoat calls for respiratory protection, and OSHA noted in a 2000 interpretation letter that diisocyanates have poor warning properties for air-purifying respirators.

VOC limits for floor coatings by jurisdiction#

Floor coatings are limited to 50 g/L (0.42 lb/gal) VOC in the South Coast under SCAQMD Rule 1113 (amended 2016-02-05), against 400 g/L (3.3 lb/gal) under the federal EPA AIM rule. The South Coast figure is counted less water and exempt compounds. In the EU, Directive 2004/42/EC category (j), two-pack reactive performance coatings for floors, allows 140 g/L (1.17 lb/gal) water-based and 500 g/L (4.17 lb/gal) solvent-based since Phase II began on 2010-01-01.

Limits for other product categories and jurisdictions are collected under VOC limits for construction chemicals.

What Are the Alternatives to Polyaspartic Floor Coatings?#

Five resin and floor classes compete with polyaspartic floor coatings, and each wins where build, cure speed, chemistry or moisture rules polyaspartic out.

The head-to-head figures sit under epoxy vs polyaspartic vs polyurea floor coatings.

The table below sets each alternative against polyaspartic with one value from a named product.

Polyaspartic Coating Grades, Packaging and Sourcing#

Polyaspartic coatings are sold as two-component kits at 70 to 100 % solids, in grades that differ by solids, film limit per coat and pot life, and buyers compare them on data-sheet basis, site-temperature cure and the entry 74 label. The five buyer checks below compare grades on paper before a sample is ordered.

• Volume solids, and the wet or dry basis of each coverage figure per coat.
• Pot life and touch-dry time at the expected site temperature and film.
• Maximum wet film per coat for the grade, since one grade of the reference product stops at 254 µm (10 mils) WFT.
• Monomeric diisocyanate content in section 3 of the SDS and, for EU supply, the entry 74 label statement.
• Test methods and editions behind the adhesion, abrasion and hardness values.

An applicator is needed in practice: the short pot life asks for an organized crew, and EU use needs isocyanate training. How to compare makers' documents is covered under construction chemicals manufacturers and suppliers.

Where Does a Polyaspartic Coat Fit in a Resin Floor System?#

A polyaspartic coat is the top wearing and UV layer of a resin floor system, applied on prepared concrete or an epoxy base, and its dry film per coat falls in the FeRFA seal, coating and high-build bands. A coat of 6 to 15 mils WFT at 94 % volume solids dries to 143 to 358 µm (5.6 to 14.1 mils): the thinnest coat sits just inside Type 1 (up to 150 µm), and thicker coats fall in Type 2 (150 to 300 µm) and Type 3 (300 to 1,000 µm).

Where the floor also protects the concrete against ingress, EN 1504-2:2004 applies as the surface protection standard (EN 13813:2002 clause 5.1). Polyurea and polyaspartic kits on roofs fall under EAD 030350-00-0402 (August 2018, cited in the OJEU in 2020) as liquid-applied roof waterproofing kits, and they belong to waterproofing rather than flooring.

Polyaspartic floor coating FAQs#

What does a polyaspartic floor cost per square meter?#

A 2026 US vendor cost guide (Armor Garage) puts installed polyaspartic floors at USD 75.35 to 129.17 per m² (USD 7 to 12 per ft²) and installed polyurea floors at USD 53.82 to 107.64 per m² (USD 5 to 10 per ft²).

Prices by system, each with its source and date, are compared under epoxy and resin flooring cost.

Can polyaspartic be applied directly to concrete?#

Yes, on mechanically prepared concrete: a polyaspartic coat can go directly onto concrete ground to CSP 3, the profile its data sheet in the preparation section asks for. On a slab on grade, a vapor or moisture barrier goes under the coating first.

Does a polyaspartic floor resist hot-tire pickup?#

Polyaspartics can be formulated as non-rigid coatings that resist hot-tire staining and delamination, according to a Tnemec technical resource, but the GP4850 data sheet gives no guarantee against tire staining. A test patch under the vehicles that will use the floor shows the result before the full area is coated.

Is a polyaspartic floor worth it in a garage?#

Garage systems combine an epoxy basecoat, a flake broadcast and a polyaspartic or aliphatic polyurethane topcoat, or use polyaspartic alone.

Build-ups and return-to-service times for residential garages are compared under garage floor coatings.

Can polyaspartic coatings be used on driveways and outdoor concrete?#

Yes on concrete: the aliphatic backbone of a polyaspartic coat gives the UV stability that exterior slabs need, where epoxy films yellow. Sealers for asphalt driveways are a different product class.

Is polyaspartic better than epoxy?#

Neither is better across the board: epoxy builds thicker and harder, while polyaspartic cures faster and keeps its color. The two data sheets in the alternatives table show the trade-off: Shore D about 76 for the epoxy against 69 for the polyaspartic, and foot traffic after about 24 hours at 20 °C (68 °F) against 6 hours at 25 °C (77 °F).