THERMOTEK™ BLEED BLOCK PRIMER is a water-based acrylic roof-primer with excellent resistance to stop the yellowing in acrylics and silicone coatings, over asphalt systems substrates (modified torch and self-adhesive systems, BUR systems).

THERMOTEK™ BLEED BLOCK PRIMER is designed to prevent the yellowing in acrylics or silicone coatings applied over asphalts waterproofing systems. 

• Prevents staining of the final coating.
• Helps prolong the whiteness of the acrylic or silicone coatings.
• Easy to apply.