Zinsser Bullseye 123 in basic terms is a Primer that will stick to most surfaces including Tile, Formica, Galvanised metal, its even great as a rust inhibitive. An example is Galvanised steel, everybody in the trade Knows that with traditional products you would have to acid etch the steel, then apply a suitable primer then your undercoats and then your top coats, but with Zinsser Bullseye 123 you apply straight onto the surface leave to dry then apply your top coats Bingo you have saved 2 coats and a load of time.