Acetone is the most popular and effective cleaner for removing uncured resin / gelcoat & topcoat from brushes and rollers. It can also be used to clean pre-sanded laminates prior to laminating. Acetone will not remove resin from tools, brushes, etc. after the resin has set. It is not recommended for thinning resins or gel coats as this can lead to added pinholes and premature yellowing. It should be kept in covered containers as it evaporates quickly and is highly flammable. It is not recommended for cleaning unprotected hands.