P-21 Polyurea Basecoat/Primer

P-21 is a two-component clear polyurea coating for use as a primer on concrete and as a basecoat for broadcast aggregates and flake. It is the perfect choice for priming concrete that has been exposed to oils, or when quick turn-around time is required. It comes in standard speed with the option of an accelerator to achieve faster cure or if applying in colder temperatures.

Uses and Benefits

P-21 is most often used as a clear basecoat, with added color packs, for flake systems or as a concrete primer. It has excellent adhesion properties and can be used as a primer for tinted Polymer Nation finish coats.

Limitations

P-21 is designed to be applied between 8-10 mils. It is not intended as a finish coat as it will amber; likewise, when used as a primer/basecoat in outdoor applications, P-21 will amber, even in flake systems. Ideal application temperatures are between 50-90 degrees Fahrenheit. Cooler temperatures will increase cure times (see Accelerator below). Warmer temperatures will decrease working and cure times. Verify that substrate temperature is above 5 degrees of dewpoint during application and cure of material to avoid any potential condensation.

Preparation

The preparation method for each project is determined by a full understanding of the substrate to be coated, the chemistry of the coating system being used, the coating system thickness, and numerous other factors. The coating installer should fully read and understand ICRI Guideline NO. 310.2R-2013 and OSHA 29 CFR 1926.1153 before starting preparatory work. The aim, of preparing a substrate for coating applications, is to roughen the surface, remove weak layers, contaminants, dirt, debris and present a solid, clean, dry substrate for the primer. If unsure as to the level of preparation needed contact Polymer Nation at Lab@polymerNation.com.