Product #2 – High-Build Chemical Resistant Epoxy Coating
Recommended System:
Primer: Product #12 Epoxy Primer (primary choice)
Alternate Primer: Product #899 Epoxy Primer (where specified or moisture conditions require)
Topcoats: Two coats of Product #2 High-Build Chemical Resistant Epoxy
System Thickness: approximately 21–27 mils (combined)
1. General Information
Product #2 is a 100% solids, high-build chemical resistant epoxy coating designed for concrete, steel, and other structural surfaces exposed to non-oxidizing acids, alkalines, solvents, and industrial cleaning or process chemicals.
The standard recommended system is Product #12 Epoxy Primer followed by two coats of Product #2 High-Build Chemical Resistant Epoxy. Product #2 is supplied as a pigmented coating.
Primer Selection – Product #12 vs Product #899
Both Product #12 and Product #899 are fully acceptable and compatible primers beneath Product #2. In terms of adhesion, both perform similarly and can be used successfully in most installations.
Product #12 is recommended for most applications because it offers slightly better chemical resistance than Product #899. If a scrape or gouge penetrates the Product #2 topcoat but does not cut through the primer, the primer layer can still provide chemical protection. This gives the system added resilience in aggressive or unpredictable environments and helps prepare the floor for possible future use of harsher chemicals.
Product #899 may be used anywhere and remains a solid choice. Its main practical advantage is in slightly damp concrete conditions where it is not possible to achieve a fully bone-dry substrate. In those borderline moisture situations, Product #899 may wet and anchor into the concrete a little better, reducing installation risk.
Outside of that moisture edge-case, both primers perform well; Product #12 simply provides a higher level of chemical resilience as the default choice.
2. Surface Preparation
Proper surface preparation is the most important part of any epoxy installation.
All substrates must be prepared to a minimum profile of ICRI CSP-2 or better.
For detailed procedures, see our
Epoxy Surface Preparation Guide.
Before installation, check the following:
- Concrete placement: Slabs on grade should have a functioning vapor barrier. If moisture migration is present, a moisture mitigation system may be required.
- Finishing techniques: Hard-troweled or dense surfaces must be mechanically profiled.
- Age of concrete: Concrete must be cured, clean, and structurally sound.
- Previous contamination: Oil, grease, solvents, and chemical residues must be completely removed.
- Present condition: Remove weak, punky, dusty, or scaling concrete. Repair cracks, spalls, and delamination before coating.
Environmental conditions:
Ideal substrate temperature: approximately 75°F
Minimum slab temperature: 60°F
Avoid high humidity and conditions that may cause amine blush.
3. Material Quantities (Per 1,000 ft²)
| Component |
Coverage |
Approximate Quantity |
| Product #12 Primer (or Product #899 if specified) |
200–275 ft² per gallon |
4–5 gallons |
| Product #2 High-Build Chemical Resistant Epoxy |
160–200 ft² per gallon per coat |
10–12.5 gallons (total for two coats) |
4. Installation
A. Product #12 Epoxy Primer (Recommended)
1. Mixing
- Stir each component individually before mixing.
- Mix two (2) parts by volume of Part A with one (1) part by volume of Part B for approximately three minutes with a low-speed drill and mixing paddle.
- If thinning is desired, add no more than one pint of xylene or MEK per gallon at the time of mixing.
- Only mix the amount of material that can be applied in 15–20 minutes (less in hot weather).
- Do not leave mixed material sitting in the pail for more than about three minutes, or working time will be significantly reduced.
2. Application
- Pour the mixed primer in a ribbon onto the prepared concrete.
- Spread with a flat trowel, notched squeegee, or roller to a coverage of approximately 200–275 ft² per gallon.
- For smaller batches, the “dip-and-roll” method is acceptable and often easier.
- Back-roll with a short-nap roller to even out the primer.
- Allow the primer to cure 8–12 hours at 75°F before topcoating.
- If the primer is allowed to sit more than 24 hours, lightly sand and clean before applying Product #2.
B. Product #2 High-Build Chemical Resistant Epoxy Coating
1. Mixing
- Stir each component prior to mixing.
- Mix two (2) parts by volume of Part A (base) with one (1) part by volume of Part B (hardener) for approximately three minutes with a low-speed drill and mixing paddle.
- If slip resistance is desired, add Epoxy.com Anti-Skid Fine at a rate of 8–12 volume ounces per gallon of mixed epoxy and mix for an additional minute until well dispersed.
- Mix only the amount of material that can be immediately poured out and spread.
2. Application
- Immediately pour the mixed material onto the floor in ribbons or strips.
- Spread at a rate of approximately 160–200 ft² per gallon with a squeegee.
- For smaller batches, the “dip-and-roll” method can also be used if batch sizes are kept manageable.
- Back-roll immediately with a short to medium nap roller. Do not over-back-roll, as this can pull the coating too thin.
- Maintain a wet edge as you work to avoid lap lines and cold joints.
3. Cure Schedule
- Allow to cure overnight, or a minimum of 12–16 hours at 75°F, before applying the second coat.
- Apply the second coat using the same procedure as the first.
- Allow the system to cure approximately 24 hours before light traffic, 48 hours before heavy traffic.
- For hot tire traffic and full chemical exposure, allow 5–7 days for full chemical cure.
More Information
To read more about these and other epoxy systems, visit our main site at
Epoxy.com.
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