Surface to be coated must be clean and free of water, oil, rust, dust, dirt, mildew, soldering fluxes, tree sap, or any foreign matter that can potentially interfere with adhesion. Cleaning is necessary. We recommend a detergent wash and rinse as described below.
Power-wash with Tri Sodium Phosphate (TSP) to remove "chalk", dirt, rust, and loose paint. Rinse thoroughly and let dry completely. Alternately, hand scrape peeling sections with a wood or plastic scraper (the sharp end of a cedar shake works well). Clean rust areas with a stiff bristle brush. Pour a heavy-duty solution of TSP in warm water on roof and scrub with a stiff bristled brush or floor broom. Rinse thoroughly and let dry completely.
Spot prime rusted areas. Coat the entire roof with Calbar 10-520 rust inhibitive primer.
Coating Type : Solvent based air dry V.O.C. : 150 grams/liter Pot life : Single component Shelf life : 24 months Required thickness : 3 wet mil per coat Coverage : 400 square feet per gallon Packaging : 1 gallon, 5 gallon, 55 gallon Color : Red oxide
Damaged areas may be repaired using Calbar Roof Sealer (CRS). Please refer to the appropriate data sheet for this product.
Adhesion shear strength 600 PSI Peal strength 35 PSI Impact adhesive 1100 PSI Resistance to rust Satisfactory Viscosity @ 70º F 70 KU Dry time @ 80º F (70% RH) 2 hours to re-coat Total cure @ 80º F (70% RH) 2 hours Solids content 70 % 2 Application equipment Brush or spray Cleaning of equipment Xylene
Areas with rust must be spot primed. A test patch should be applied to any roof that has been coated with a factory finish. We strongly recommend that proper adhesion to your factory finish be tested using the Adhesion Tape Test as defined by ASTM D-3359. A copy of this procedure is available on our web site. If you are unsure whether or not your roof has a PVFD (Kynar 70) finish, you may test it using the method that is defined on our web site.
Apply only at temperatures from 40º F to 90º F (air and surface). Do not paint if rain is forecast within the tack-free time. Starting after 10 am and stopping by 4 pm gives best results. Condensation on wet paint film will flatten the finish of the coating prematurely and unevenly, but does not affect adhesion or durability. Never paint over condensation. Painting at temperatures above 90º F will cause all coatings to dry too quickly, resulting in poor adhesion and flexibility. Refer to the Material Safety Data Sheet for complete health and environmental information.