Polyprime 21 Two-Component Epoxy-Polyamine Primer - 3 Gallon Kit

High-Solids Penetrating Epoxy Primer for Superior Adhesion

Prepare Concrete & Plywood for Long-Lasting Coating Performance

Polyprime 21 is a high-performance, two-component epoxy-polyamine primer engineered to create exceptional adhesion between concrete or plywood substrates and protective coating systems. Designed with a low-viscosity, high-solids formula, it penetrates porous surfaces to strengthen the bond and improve the durability of epoxy, polyurea, and polyurethane flooring systems. It is also ANSI/NSF 61 approved for direct contact with potable water.

Whether you're preparing industrial floors, commercial facilities, waterproofing systems, or specialty coating applications, Polyprime® 21 helps create a reliable foundation for long-term performance. Its seamless finish, excellent adhesion, and penetrating properties reduce the risk of coating failure while maximizing the lifespan of your flooring system.

Suitable for application by airless sprayer, brush, or phenolic resin roller, Polyprime® 21 is easy to apply across a variety of project sizes. It offers approximately 300 sq. ft. of coverage per gallon, making it an efficient solution for both small and large-scale surface preparation projects.

Benefits

• Excellent adhesion for concrete and plywood substrates
• High-solids epoxy primer for maximum durability
• Low-viscosity formula penetrates porous surfaces
• Improves bond strength for epoxy, polyurea, and polyurethane coatings
• Creates a seamless base coat for coating systems
• Approximately 300 sq. ft. coverage per gallon
• Fast tack-free time of approximately 4–6 hours at 75°F (24°C)
• Compatible with airless sprayers, brushes, and rollers
• ANSI/NSF 61 approved for direct contact with potable water
• Helps reduce coating failures caused by poor substrate preparation

Why Choose Polyprime® 21?

Proper surface preparation is essential for any successful coating installation. Polyprime® 21 delivers the penetrating performance needed to improve adhesion, reduce substrate porosity, and create a strong foundation for high-performance flooring and waterproofing systems. Its high-solids formulation, excellent coverage, and professional-grade performance make it an ideal primer for demanding commercial, industrial, and residential applications.