Liquid Rubber Coatings has been used directly over plywood to make a finished roof in situations where expediency and minimal cost were the primary considerations. Although this procedure results in a weaker roof structure, water-tightness can be achieved if the application is performed carefully. The joint between sheets should be positioned directly over a roof truss and securely fastened to prevent warping. Next, to seal the pores, coat plywood with an oil based primer. Allow an overnight cure. Seal the joint by bridging it with a 6" wide polyester fabric strip.
Apply a light coat of EPDM rubber over the joint, lay fabric into wet rubber and smooth out wrinkles. Complete job by applying a liberal coat of Liquid Rubber over entire roof surface, being especially careful to completely cover the fabric over the joint without skips or pinholes. Using an oil base primer on the wood considerably improves the appearance of a one-coat application of Liquid Rubber.
Liquid Rubber is excellent for Wood Surfaces Repair Product; Liquid Rubber can be applied to wood. We recommend first applying a primer coat using an oil base primer and then the Liquid Rubber after the primer has dried. Liquid Rubber can be colored using "universal" colorants available at any paint store. You can add up to one cup per gallon of paint thinner for easier handling when going over wood. Liquid Rubber is slippery when there is only a fine mist of water on its surface. Silicone and oil-based materials are considered unstable and should be avoided.