The surfaces to which your ORAFOL vinyl films will be applied must be smooth, non-porous and thoroughly clean from dust, grease, or any contamination. Primer and flat paints are too porous of a coating and would collect dirt and moisture resulting in poor adhesion between the adhesive vinyl and the substrate. A smooth, properly cured, glossy exterior rated enamel coating would be ideal for vinyl application. Freshly lacquered or painted surfaces should be allowed to dry for at least three weeks and to completely cure respectively. The compatibility of selected lacquers and paints should be tested by the user, prior to application of the material.