P-21 Polyurea Basecoat/Primer


Product Overview

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 three speeds, Summer, Winter and High Heat. All three speeds use the same Part B.


P-21 is most often used as a tinted basecoat for flake systems or as a concrete primer .  It has excellent adhesive properties and can be used as a primer for tinted Polymer Nation finish coats. It is not inteded as a finish coat as it will amber.


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 consult SSPC Good Painting Practice Manual 1 and 2 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.

The data below represents the most pertinent information needed by a professional installer to understand and efficiently install this material. The data was gathered at temperatures of 72-75 F and 30-50% RH. A wide array of independent and company test data has been compiled on this product but is too large to place on this Technical Data Sheet. Please direct inquiries for detailed test reports on this product to lab@polymernation.com.


Description Results Notes
Kit Yield in Gallons 3 Material can be supplied in larger packaging upon request and with minimum quantities
Number of Components 2
Mix Ratio Liquids by Volume 2:1 It is always preferred to mix the entire kit, whenever possible, to avoid off-ratio mixtures
Ideal Application Temperatures  50-80F Verify that substrate temperature is above 5 degrees of dewpoint during application and cure of material to avoid a potential amine blush
Mixed Viscosity in cP@25C/77F 350-450 Warmer temperatures will reduce viscosity and lower temperatures will increase viscosity
Gel Time 25 min. Warmer temperatures will decrease gel time and lower temperatures will increase gel time
Dry to Touch 1.5 Hours Warmer temperatures will reduce time and colder temperatures will increase time
Through Dry 2 Hours Warmer temperatures will reduce time and colder temperatures will increase time
Dry to Walk 4 Hours Warmer temperatures will reduce time and colder temperatures will increase time
Dry to Lightly Use 8 Hours Warmer temperatures will reduce time and colder temperatures will increase time
Full Cure 3 Days Warmer temperatures will reduce time and colder temperatures will increase time
Pendulum (König) Hardness at 24 hours 20 Warmer temperatures will increase hardness
Pendulum (König) Hardness at 7 days  40 Warmer temperatures will shorten time to reach full hardness
Gloss @ 60 Degree Angle 60-70 Applying material close to dew point will decrease gloss and may result in an amine blush
VOC’s of Mixed Material  <50 g/L EPA Method 24
Color Scale per ASTM D1500 0.5-1 Clear to slightly amber before colorants are introduced
Solids by Volume Mixed 100%
Storage 60F-90F Store material between 60-90 degrees F in a protected dry location.
Odor Subtle Measuring odor offensiveness is difficult so experience with chemicals has been consulted here
Application Thickness in Mils 8-10 mils, 150-200 square feet per gallon.
Disposal Dispose of  material, containers, solvents, etc. per Federal, State and local guideline, rules and laws
Available Colors Clear
Mixing & Installation Combine 2 parts A and 1 part B into a single container, large enough to accept the entire kit. Mix at 350 RPM for 2-3 minutes using an appropriate mixing blade and making sure not to introduce excessive air into the solution. Pour the entire content from the container onto the floor and follow normal squeegee and back roll techniques. Material can also be bucket rolled on smaller projects. Recoat within 2-24 hours. Clean tools with a solvent similar to Xylene or Acetone.
Polymer Nation believes the information contained herein to be true and accurate. Information contained herein is for evaluation purposes only.

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