Bostik Roll-Cote™ 4 Gallon is a high-performance, water-based moisture-vapor-barrier coating and primer designed to reduce substrate moisture-vapor emissions, prime floors before underlayment application, and block alkalinity in concrete. Its one-component, no-mix formula helps combine multiple floor-preparation steps into one system while supporting faster return-to-service on flooring projects.

Roll-Cote can be used on properly prepared concrete and wood-based subfloors and is compatible with a wide range of flooring systems, including hardwood, resilient flooring, carpet, tile, self-leveling underlayments and floor patches when installed within Bostik requirements. The black coating provides a clear visual indication of coverage during application.

For applications up to 90% RH or over wood subfloors, Bostik lists one coat at approximately 200 sq. ft. per gallon. For applications up to 99% RH, use two coats at a total coverage rate of approximately 100 sq. ft. per gallon. For hardwood flooring or tile applications on concrete, Bostik rates the two-coat system for unlimited moisture vapor when used according to the current technical data sheet.

Application Video

Contractor Notes

• Apply with a 3/8" nap roller to a properly prepared substrate.
• Bostik lists an application temperature range of 40°F to 90°F.
• One-coat applications are walkable in approximately 30 minutes and ready for flooring installation in approximately 1 hour; after a two-coat application, wait approximately 2 hours before installing flooring.
• Do not apply to surfaces with visible or standing moisture.
• For resilient flooring and certain adhesives, a self-leveling underlayment or cementitious patch may be required for compatibility and to prevent telegraphing. Follow the current Bostik TDS and flooring-system requirements.
• Roll-Cote is not intended for negative hydrostatic pressure conditions.

Frequently Asked Questions

• Does Roll-Cote need to be mixed? No. It is a one-component, premixed product; if settling occurs, Bostik says it may be stirred before use.
• How much does it cover? Approximately 200 sq. ft. per gallon for one coat or 100 sq. ft. per gallon total for two coats, depending on the application.
• Can it be used over wood subfloors? Yes. Bostik lists plywood, OSB and high-performance subfloor panels as approved substrates for one-coat applications.
• Can floating floors be installed over Roll-Cote? Yes, when installed in accordance with Bostik and flooring-manufacturer requirements.
• Can Roll-Cote be used on green concrete? Yes. The current Bostik TDS permits use over properly prepared green concrete at least 5 days old.
• Is Roll-Cote low VOC? Yes. Bostik lists the product as low VOC, below 15 g/L under SCAQMD Rule 1113.

Documents & Resources

• Bostik Roll-Cote Product Page
• Technical Data Sheet
• Safety Data Sheet
• Roll-Cote Frequently Asked Questions
• Bostik Roll-Cote Video