PTI’s No POP is a retarder specially formulated solvent that is not photo chemically reactive. This product is used as an additive to slow down the dry time of fast drying paints and primer. During hot and dry temperatures, coatings have a tendency to “solvent pop” and/or “dry spray”. That is, small air bubbles forming at the surface of the paint or the paint drying before it hits the substrate. This retarder keeps the material wet allowing it to flow, dry, and cure as it should.