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Aircraft Maintenance TroubleShoot > Aircraft Paint Stits Poly Fiber and Randolph Cratering and crawling of primers and urethanes1. Surface not properly cleaned of wax and oil. Contamination from oil, silicones, or solvents creeping out from under rivet heads, seams, cracks or joints and spreading over the adjacent surface.2. Contamination from adjacent spray operation. 3. Handling of surfaces with greasy or unclean hands. 4. Not scuff sanded. Fully cured primer should be thoroughly scuff sanded in all areas, particularly counter sunk rivet heads to provide a uniform flow-out of the wet film. Urethanes will tend to crawl from a very smooth, semi-gloss primer surface to an adjacent scuff sanded surface. The primer surfaces should be uniform in texture and thoroughly clean. 5. Wrong solvent or reducer used to clean primer or finish from spray equipment after last used. 6. Water and oil from compressor mixing with coatings. 7. Oil from base paints leaching from old pressure pot supply hoses. 8. First coat of primer laid down too heavy. First coat should be a wet tack coat. 9. Tack rag rubbed too hard on surface, thus depositing tacky residue, or poor quality tack rag used.
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