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Automotive spray paint troubleshooting

Below are eight common automotive spray paint problems, what causes them, and how to repair the finish.


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. Let's see how we can troubleshoot the problems.


Problem: Dry Spray: Dry paint dust settling over previously painted areas.
Causes: The automotive spray paint is 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, or 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: The automotive spray paint is 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: The automotive spray paint can was 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: Mottled Surface: Uneven appearance (generally effects metallic)
Cause: The automotive spray paint can was not shaken enough; paint can held too close to surface; surface too hot or too cold.
Repair: Respray as required using a swirling or rotating motion while spraying to deposit the metallic particles evenly on the surface.

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 of automotive spray paint. 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.



Need supplies and materials for your automotive spray paint job ? Check with the leaders in the industry, here.


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