Common painting failures that you might experience...
Sagging (recognised as "curtains") occurs when:
Paint is applied in excess of the DFT specified.
Too much thinner has been added to the paint.
The gun is held too close to the surface.
Pinholes occur when:
Using the wrong spraying technique, such as excessive air pressure, excessive film thickness, strong wind (too much ventilation) or too much application distance may cause craters, pinholes and pores.
Pinholes in a paint film can also result from overspray.
Blistering can be caused by a number of different conditions: • Soluble salts contaminating the substrate or contaminating the surface between coats.
Contamination of the surface (e.g. oils, waxes, dust, etc.)
Poor or inadequate solvent release from the coating. Entrapped solvents can increase the water absorption and moisture vapour transmission of the coating and lead to blistering.
Lifting is a raising of the undercoat.
It is caused by a stronger solvent in the topcoat attacking the previously applied film.
