NanoTech Cool Roof Coating FAQ

For proper application, thoroughly clean the existing roof to remove dust, chalky residue, bitumen, grease, and loose materials. Use only a pressure washer for cleaning - solvent-based cleaners must be avoided. If pressure washing doesn't fully clean the roof, contact NanoTech support before using any cleaning agents to ensure compatibility. Allow the roof to dry completely before priming or coating. Conduct adhesion tests to determine if primer is necessary, and complete all essential repairs with sufficient cure time before proceeding.

NanoTech Materials requires adhesion testing on all roofing substrates before coating application. The recommended method is the ASTM D903 'Peel Adhesion' test. First, prepare the test area by cleaning and creating a sample coating section. Apply a single layer of Cool Roof Coat to a 6" by 2" area, then embed a 6" portion of a 1" x 12" fabric strip into the wet coating. Apply another coating layer over the fabric and allow 8-48 hours drying time. For evaluation, use a force gauge to pull the fabric upward at a 90-degree angle - the average force should exceed 2 PLI (Pounds per linear inch). If the test fails, NanoTech Primer is required, and the test must be repeated. A second failure means the application should be rejected.

The NanoTech Cool Roof Coating should be applied in two coats. First, apply a base coat at approximately 2.5 gallons per 100 ft² to achieve a Wet Film Thickness (WFT) of ~28 mils using a 3/8 in nap roller, brush, or airless sprayer. After allowing sufficient drying time (longer in cooler or humid conditions), apply a second coat at the same rate to achieve a total of ~56 mils WFT, which typically dries to ~40 mils after shrinkage. For a 20-year warranty with enhanced hail protection, add a 1.5-gallon/100 ft² base coat of NanoTech Materials Base Coat before the two standard coats.

For metal roof preparation: 1) Remove loose rust and scale with a wire brush, 2) Remove any aluminized asphalt or asphaltic mastic, 3) Pressure wash using TSP or another suitable cleaner and rinse thoroughly, 4) Treat rust areas with NanoTech Materials Rust Inhibiting Primer if needed, 5) Ensure the substrate is intact and secured to the roof deck, 6) Spot-prime any remaining aluminized asphalt that cannot be removed, 7) Prime all non-painted or galvanized metal components with Rust Inhibiting Primer at 100–200 sq ft per gallon, and 8) Bridge significant gaps or holes with NanoTech Materials Roof Sealant and embedded polyester fabric to ensure a continuous final coating.

The NanoTech Cool Roof Coat system has several important limitations: It should not be applied during inclement weather, if temperatures are below 45°F, or if relative humidity exceeds 85%. The roof surface must be thoroughly prepared and free of standing water or gross ponding prior to application. The system must follow commonly accepted roofing and waterproofing standards. For warranty validity, the system must be installed by an Approved Applicator, meet minimum Dry Film Thickness requirements in all areas, and ensure a continuous membrane. The roof should not have ponding water that remains for over 48 hours after precipitation ends.