Now you can prime and paint right over cured POR-15 with POR-15 High Build Primer. This "interlocking" primer has special adhesion characteristics that make it perfect for most painted surfaces, especially POR 15. This product is a superior primer for any type of paint. It's a tough yet sandable, single-component primer containing over 60% solids- which is more than double conventional primers. This provides superior leveling characteristics to help overcome surface irregularities. This product is highly resistant to penetrating topcoats, like lacquers, enamels, and two-component finishes. Sands very smoothly.
Lightly sand well-cured paint or POR 15 with 320 grit sandpaper, top with POR 15 High Build Primer.