Gel formulation, acid based descaler and oxide remover. It removes any kind of incrustations and limescale formations (barnacles) from outdrives and hulls made of either breglass or rubber. Rust remover and surface brightener for propellers made of stainless steel, brass, bronze, etc.., and for any kind of surface of boat or in atable boat. It also removes water-lines and yellowing from breglass.DIRECTIONS FOR USE: Remove any excess of limescale by hand, then apply with a paint-brush the product onto any encrusted, oxidized and yellow surface. Leave to act for 3-15 minutes. Rinse well with water and if possible clean metal parts with Forza100. Treated areas will look as good as new.