SPRAY PAINTING PITFALLS

Whether using an aerosol can, an HVLP system, or compressed air and a spray gun, the best way to apply automotive applications is to spray it. Sometimes, however the final finish doesn't come out quite perfectly. Below are eight common problems, what causes them, and how to repair the finish.

Problem: Dry Spray: Dry paint dust settling over previously painted areas.
Causes:   Paint drying too quickly; work piece too large to paint with an aerosol;  application too slow; spray can is too far from surface.
Repair:    Sand with a fine grit sandpaper followed by compounding and polishing; Refinish as required.

Problem: Blistering: Bubbling, pitted or swollen appearance.
Causes:   Trapped solvents; painting over dirt or moisture; rust under the surface.
Repair:    Sand down and refinish; if necessary, sand down to bare metal. Ensure surface is completely clean before repainting.

Problem: Runs or Sags: Coating does not adhere uniformly to the surface being painted.
Causes:  Paint drying too slowly; sprayed over wax, oil, or grease; finishing coats too heavy; paint can or work surface too hot or too cold.
Repair:   If wet: use camel hair brush and brush out sag and recoat surface. If dry: sand with fine grit paper, compound & polish; or refinish.

Problem: Orange Peel: Surface looks like the skin of an orange.
Causes:   Paint can held too far away from the surface; shop temperature is too high (for best results, apply between 65F and 75F); spray nozzle is clogged.
Repair:   Sand with a grit sandpaper (600 or finer) & use a fine compound to rub out orange peel. If that fails, remove paint and refinish.

Problem: Spitting: Little or no paint coming from nozzle.
Causes:   Nozzle obstructed or clogged; valve clogged.
Repairs:  Remove nozzle from can and put several drops of lacquer thinner in the valve. Do not poke or pick at the valve. Soak nozzle in lacquer thinner for a few seconds replace the nozzle in can with a slight twisting  motion. Do not push nozzle down into can.

Problem: Fish Eyes: Small crater like blemishes in the finish. 
Causes:  Silicone on the surface. Improperly cleaned work piece. 

Repair:   If still wet: wash off paint. Thoroughly clean surface using Eastwood's PRE Paint Prep (#1679Z).Repaint surface.

Problem: Lifting or Wrinkling: A swelling or wet film.
Causes:   Improper drying of the last coat. Applying lacquer over enamels.
Repair:    Material must be removed and the surface resprayed. Check content of  top coat and substrate coatings or primers before reapplying paint.