The #390 Gray Mirror Backing Paint is specially formulated to serve as a protective coating on silver for decorative applications. This high-solids (more than 60%), lead-free coating can be applied directly on silver or on top of copper to provide superior protection for silver from corrosion. The paint can be applied using brush, spray, roller, or curtain coating. May be thinner with a variety of solvents to meet stringent air quality standards. Use a thinning ratio of between 2:1 and 1:1 paint to thinner. Approximate coverage is 500 square feet per gallon.