P-151 Single-Ply Primer

SKU: P-151-5

Designed for use over TPO, PVC, and Hypalon, P-151 offers tenacious adhesion when paired with our 100% Silicone Roof Coatings. Single-ply membranes can often pose an adhesion problem for any roof coating. This primer actively etches into the single-ply membrane and bonds tightly to the silicone, giving it tenacious adhesion to both the membrane and the silicone coating.

Available in: Transparent Charcoal color and 5-gallon containers.

Application: Spray-applying is recommended.


P-151 is a primer designed for surfaces which traditionally present adhesion problems for silicone roof coatings, such as TPO and PVC. It can also be used over a variety of other substrates to enhance adhesion. It is a fast-drying primer that provides strong adhesion on weathered and un-weathered surfaces. P-151 also resists ponding water, providing additional protection on your roof. P-151 is intended for use over a cleaned roof surface; contaminants such as dirt and debris prevent proper adhesion. P-151 is intended to be used in conjunction with a silicone roof coating.

Storage and Shelf Life: P-151 has a recommended shelf life of 12 months from the date of manufacture when stored in unopened containers between 40°F and 80°F. Refer to product packaging for date of manufacture.


Prep: Prior to starting your roofing project, prep the roof by power-washing, removing dirt and debris, and making any necessary repairs. Ensure roof is completely dry prior to applying any primer or silicone. For more detailed preparation instructions, view our Technical Resources page.

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: Apply P-151 until roof appears to be a consistent charcoal color. Apply at a rate of 330 square feet per gallon (0.33 gallons per square). Additional material may be required for porous substrates. Apply primer with small airless sprayer or a medium nap roller. Over-application or use of multiple coats can reduce adhesion performance. Silicone coating should be applied within 7 days.

Spray: Contact PM for specific pump, hose, and spray gun requirements.
Roller: 1¼” nap roller.

Limitations & Precautions:

P-151 should not be applied when it is raining or when the threat of rain is imminent. P-151 should be applied in only one coat. This product contains flammable solvents and is intended for use by professional contractors only. Adhesion tests should always be performed to ensure suitability of use.

Technical Documents