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Paint Application Problems - Lifting (Shrinkage)
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Old paint film or base coat is affected by the solvent contained in the new upper coat. Paint surface warps or shrinks, resulting in finish wrinkles.
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CAUSES:
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Painting over the existing paint that is in poor condition, or that has poor solvent resistance (oxidation-dry enamel, deteriorated denatured acrylic lacquer or poorly dried paint film). | |
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Basecoat with poor solvent resistance was covered with polyester body filler and painted over. | |
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Painting in sandwich layers (lacquer, reaction harder, lacquer). | |
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Applied additional paint before a previously applied dual-component paint was completely dry. | |
PREVENTION:
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Remove the deteriorated old paint film with a sandpaper or remover. | |
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Apply sealer then urethane-based primer surfacer to the seal and cover the old paint film with poor solvent resistance. | |
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Do not apply polyester body filler over the old paint film with poor solvent resistance. | |
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Do not apply additional paint before a dual-component paint is completely dry. Force dry if needed. | |
CORRECTIVE ACTIONS:
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If the symptom is not severe, apply a thin coat of paint to the surface in several steps preventing the solvent from penetrating through the topcoat. | |
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If the symptom is severe, remove the paint thoroughly and repaint. | | | | 
