Tinnit™ will plate a copper clad board with a bright tin plate approx. 0.0004" thick. Enhances solderability, resists oxidation. Also use on card edge contact fingers. Supplied as a dry concentrate; just add water. One pint plates up to 600 sq. inches of copper. May be used to plate some other metals such as brass, bronze, iron; anything more active than tin. Plating is complete in about 10 minutes in a fresh solution, Tinnit™ is supplied as a dry mixture with indefinite shelf life. When mixed with water, the solution has approximately a 2 month life.