Sunnyside Methyl Ethyl Ketone (MEK) is a specialty thinner for epoxies, lacquers and adhesives, as well as polyester resins used in fiberglass repairs. It's a fast evaporating and extremely flammable solvent, so it should be handled with care. MEK is slower drying than acetone and can also be used as an effective remover for ink, adhesives and contact cement.