#9 is the standard of the industry for cleaning tools and brushes while working in polyester, vinyl ester, and epoxy resins. It is also the recommended solvent for removing greases and waxes from surfaces which are to be bonded, repaired or primed. It is not recommended for thinning resins or gel coats as this can lead to added pinholes and premature yellowing. Handle with the same care reserved for gasoline.