• LEAKING ROOFS
• ROOFS PREVIOUSLY COATED WITH ALUMINIZED PAINT/COATING
• MODIFIED BITUMEN
• "GREEN" ASPHALT PRODUCTS
• BURN OUT
• DECK DAMAGE

Vapors created from trapped moisture will not allow Polar Cap products to cure properly. Cleaning with water would just add to the problem instead use a push broom and blower instead to clean the area.

Vapor Vents should be installed when trapped moisture is suspected
(see section 5, Step #2).

A reliable indicator of moisture in the roofing substrate is slow curing of the plastic cement. Check all plastic cement repairs carefully before proceeding with primers or coating steps. Be sure that the repairs are fully cured.

An adhesion problem may be encountered if the pigment is still "active". Aluminum fines migrate to the surface creating a dusty aluminum surface. Generally, this problem is non-existent on roofs which have weathered more than 2 years. Also, aluminum paint presents a much greater problem than aluminized asphalt coatings. If the surface is still silver, rather than dull gray or blackened, use POLAR CAP RESATURANT PRIMER (PC-103) and allow for a free solvent evaporation cure time of 30 days minimum.

If a doubt exists regarding adhesion, coat a test patch in a inconspicuous area with POLAR CAP STANDARD ROOF COATING (PCS-108) or POLAR CAP PREMIUM (PCP-108). Allow 10 days cure time and them test for adhesion. It should be impossible to separate the Polar Cap from the substrate surface.

Asphalt continuously bleeds through the surface of modified bitumen products creating substandard adhesion of acrylic products. Avoid the use of Polar Cap products unless the roof has been previously coated with an aluminized asphalt product which has fully weathered and does not exhibit active leafing of aluminized pigment.

When encountering "green" asphalt plastic cements, lap cement, or fresh hot mopped roofs, these areas must weather sufficiently for free solvent evaporation. The application of acrylic Polar Cap products will not allow the escape of the solvents and blistering and weak adhesion will be the result. The only solution is to allow for complete curing until the surface is dull rather than glossy black and asphalt product is firm. The amount of cure time required will vary depending on climate, thickness and type of asphalt product.

If roofing substrate is brittle, badly blistered, or cracked, it may not be a suitable coating candidate. The 3 course repair with a wide membrane can resolve isolated and confined "burn out" conditions.

If the deck is weakened due to leak damage, it is not a suitable roof for coating until the decking and substrate have been replaced and necessary time is provided for curing of the asphalt based lap cement.