Paint cracking/bubbling after clearcoat? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-27-2008, 09:47 AM
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Paint lifting after clearcoat?

I have some older gym equipment that needed to be painted (I didnt care for the chrome look) so I decided to paint it grey, everything was looking fine until I sprayed clear. The paint started to lift.

Just wondering what could be a possible cause? Could it of been that the paint didn't have enough time to dry? even though it was dry to the touch (I gave it 12hrs to dry)

Note that the clear coat was from an aerosol can along with paint

1) Clean with paint thinner / alcohol
2) Etching primer
3) Paint
4) Clear

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Last edited by mikeweb; 05-27-2008 at 11:34 AM.
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Old 05-27-2008, 11:28 AM
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Found some info thanks to my friend Mr Google.. https://autopaintproonline.com/html/...em_solver.html

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CRACKING


Cracks or lines of various lengths and widths in the topcoat finish often resembling the cracking of dried mud.

CAUSE
Excessive film thickness of the undercoat and/or topcoat. Refinishing over a previously crazed/cracked surface. Insufficient flash time between coats and/or force drying undercoats using air from the spray gun. Mixing incorrectly or using too much hardener. Paint ingredients not thoroughly stirred or agitated. Breakdown of finish due to prolonged exposure to sunlight, moisture, and extreme temperature changes. Using generic reducers and/or hardeners.

REPAIR
Remove all cracked paint film and refinish.

PREVENTION
Apply all materials following label direction. Completely remove crazed/cracked finishes before refinishing. Do not force dry undercoats by fanning with spray gun air.Mix ingredients thoroughly using the recommended additives. Add each component in proper sequence following the recommended mixing ratio. Stir or agitate materials thoroughly before use to ensure all ingredients are in solution. Use premium two component undercoat and topcoat system to provide maximum gloss and durability. Use the recommended thinner/reducer and hardener, and then measure accurately

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LIFTING



The existing paint film shrivels, wrinkles or swells during new finish application or drying.

CAUSE
Solvents in a newly applied product attack the previous finish causing wrinkling, raising, or puckering of the paint film due to: Recoating enamels or urethanes that are not fully cured; Exceeding maximum flash or recoat times during application; Recoating a basecoat/clearcoat finish, where existing clearcoat has insufficient film build.

REPAIR
Remove lifted areas and refinish.

PREVENTION
Check questionable finishes by rubbing a small inconspicuous area with a shop towel saturated with lacquer thinner. Finishes susceptible to lifting will soften, swell or shrivel as lacquer thinner is applied. If any of these reactions occur, the following recommendations should be considered. Do not exceed a product's maximum recoat time during or after application. Allow enamels or urethanes to thoroughly cure before recoating or attempting a repair. Avoid applying undercoats or topcoats excessively wet. Avoid the use of lacquer products over an air dried enamel finish. When insoluble material (enamel/urethane) has been applied over a soluble material (lacquer): avoid sanding through and exposing areas of the soluble material. apply two component primer surfacer and/or sealer as a barrier between the new and the old finish. When applying two component undercoats over soluble finishes, the complete panel must be coated. Use water borne undercoats to repair extremely sensitive finishes.

Last edited by mikeweb; 05-27-2008 at 11:38 AM.
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