Acetone is a highly effective solvent for cleaning uncured resin from brushes and tools. It should not be used for cleaning hands.
Acetone is the most effective solvent for cleaning liquid uncured resin from brushes and tools. It is not to be used for hand cleaning as it will extract natural oils from the skin.
It should be kept in a sealed container to minimize evaporation.
Acetone is a highly flammable liquid and should be treated with caution at all times.
If the area has an old layer of Topcoat which you wish to refresh there is no need to prime the area with a product such as G4 for example. You will, however, need to sand down the area, wipe down with Acetone and reapply a new layer of Topcoat/GRP materials if required.