let me clarify Paint is a liquid solution of pigment in a suitable vehicle of oil,organic solvent, or water: liquid when applied but dries to form an adherant, protective, and decorative coating. T-1-11 is not a product number it is a specification/ product type. It is an exterior grade plywood with channel grooves. Really the paint would only be a component of an assembly. My main concern is t1-11 a weatherproof panel as is or does it need another component 'IE paint' to perform as a weatherproof panel and does it require a WRB?