I am going to paint the fibreglass lid of my old Suzuki Jeep with Hammerite. Years ago I was told that using Hammerite Thinners (to thin and clean brushes) was unnecessarily expensive and that I could use ".............." Problem is, I've forgotten what that ".........." is! I don't think it was cellulose thinners or white spirit but it might have been meths. Sadly the car shop is long gone.
Does anyone out there know for sure, please?