Is it ok to apply my Oracal vinyl directly to pre-primed MDO boards?
This would not be a good idea. The surfaces to which your Oracal 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.
