Over time, EPDM membranes will chalk off and form a thin layer of "dust" on top of the roof membrane. This prevents any roof coating, silicone or otherwise, from adhering to the EPDM membrane itself. This dust must be cleaned, and the best way to do that is with a rinseable cleaner.
P-120 EPDM Rinseable Cleaner is a primer designed to increase adhesion of Silicone Roof Coatings over EPDM roof surfaces.
Available in: Clear color and 5 and 55-gallon containers.
Application: Spray-applying is recommended.
Note: P-120 does not remain on the roof surface when applying silicone. This primer is applied and then rinsed off shortly after.
Storage and Shelf Life: P-120 has a recommended shelf life of 12 months from the date of manufacture when stored in unopened containers between 40°F and 70°F. Refer to product packaging for date of manufacture.
Mix: Separation may occur prior to product application. This is normal and does not impact performance. Product should be mixed with a drill mixer for ~5 minutes prior to application.
Application: P-120 is intended to be spray-applied. It can also be applied with a brush or roller. Surface should be clean and dry prior to application. P-120 should be applied at a rate of 1 gallon per 500 square feet. Allow cleaner to sit for 10-15 minutes on roof, then powerwash roof surface. If roof is not sufficiently cleaned for proper coating adhesion, repeat this process.
Spray: Contact PM for specific pump, hose, and spray gun requirements.
Roller: 1¼” nap roller.
Limitations & Precautions:
This product cures only by water evaporation. P-120 should not be applied when the ambient temperature is below 50°F, or if there is a possibility the temperature could fall below 32°F within 24 hours. Application is not recommended if rain or dew is expected before product dries.