Troubleshooting – Powder Coating Finish-cured Films Appearance

Posted by: FEIHONG Powders |on July 10, 2018

Problem , Cause and Remedy

PROBLEM	CAUSE	REMEDY
Poor surface flow - too much orange peel	Film thickness too thin	Increase film thickness by adjusting application equipment
	Heat-up rate too slow	Increase oven temperature (or): Modify oven baffling to increase heat rate.
	Powder resin type or formula	Check with powder manufacturer
Gloss too low for high gloss powder	Incompatible powder contamination	Clean application equipment before changing powders
	Micro-pinholing from gassing	Check substrate for porosity. Check substrate for moisture. Check powder for moisture from reclaim or compressed air. Check film thickness, coating too thick.
	Powder resin type or formula	Check with powder manufacturer
Gloss too high for a low gloss type powder	Under cured	Increase temperature of oven (or): Increase dwell time in oven
Gloss too high for a low gloss type powder	Powder formula	Check with powder manufacturer
Contamination in powder	See reclaim system, Virgin powder contaminated	Check with powder manufacturer
Inconsistent film thickness	Guns positioned wrong	Check and re-position guns so spray patterns overlap slightly
	Reciprocators not matched to line speed	Adjust line speed(or): Adjust reciprocator stroke.
	Air flow in booth disturbing spray pattern	Consult your equipment supplier
	Defective spray equipment	Go through application section check list
Off color	Improper oven exhaust	Check exhaust vent fan(s)
	Bake time too long	Adjust line speed
	Oven temperature too high	Lower oven temperature
	Variation in film thickness	See coating appearance section inconsistent film
	Powder formulated	Check with powder manufacturer
Pinholing and gassing through coating surface		See coating appearance section, low gloss
Pull-away or tearing-coating film shrinks leaving bare substrate	Uncharged powder	See application section, poor charging.
	Poor cleaning, metal preparation or dryoff	Check pretreatment equipment dryoff oven and part drainage