Common Paint Problems

How-To

Detailed solutions from Porter® to the most common paint problems faced by both painting professionals and do-it-yourselfers.

Exterior

Paint Incompatibility:

Loss of adhesion when many old coats of alkyd or oil-based paint receive a latex top coat.

Possible Causes

Use of water-based latex paint over more than three or four coats of old alkyd or oil-based paint may cause the old paint to "lift off" the substrate.

Solutions

Repaint using another coat of alkyd or oil-based paint. Or completely remove the existing paint and prepare the surface, cleaning, sanding, and spot-priming where necessary before repainting with a top-quality latex exterior paint.

Porter® System Recommendations

  • Oil Finish: Over Existing Paint - One coat of EASY-HIDE Gloss Alkyd House Paint No. 507
  • Primer: Converting to an All-Acrylic System - One coat of ACRI-SHIELD Acrylic Bonding Primer No. 515
  • Acrylic Finish: One or more coats of Super Premium ACRI-SHIELD Acrylic Finish No. 519 Flat, 739 Satin, 619 Gloss
  • Or:
  • One or more coats of ACRI-PRO 100 Acrylic Finish No. 929 Flat, 3729 Satin, or 6029 Semi-Gloss