U-pol Smooth 7 Bodyfiller can be used on the following surfaces:-
Bare metal – including Steel, Aluminium and Zinc-coated substrate – degrease and abrade with P80 paper.
Original paint surfaces (with the exception of thermoplastic acrylics) – degrease and abrade with P180 grit paper.
GRP – degrease and abrade with P80 grit paper.