P-100 is a plasticizer free, single component, water-based, acrylic primer developed to prime aged asphalt, SPF, metal, wood, and concrete surfaces, improving the adhesion and overall yield of sprayed polyurethane foam. P-100 is designed with specialized polymers and wetting agents that maximize adhesion. P-100 also has the unique ability to “breathe”, providing a completely watertight membrane while allowing trapped moisture to escape.
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Prior to coating on top of foam, be sure that the foam is not exposed to the sun for longer than a day. If you will be working on a foam roof for multiple days, you will want to make sure you prime the foam to maintain its integrity. P-100 goes on easily and holds the foam’s integrity, allowing you the time you need to finish the job.
You may also want to consider P-100 in your tie-in lines. Foam does not adhere to silicone, but it will adhere to P-100. The P-100 coat will allow the new foam to adhere to the previously installed foam, allowing you to finish the job the right way.