POR-15 Tie Coat Primer Pint Now you can prime and paint right over cured POR-15 with our new TIE-COAT PRIMER Tie-Coat Primer is a very tough and sandable, single-component polyurethane primer Bring your undercoat and topcoat together with POR-15 Tie-Coat primer Developed for those of you needing special adhesion characteristics for most painted surfaces You don't need to rough up or de-gloss the surface to get a top-notch bond