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Bad Paint Reaction

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tdipd Part of things Posts: 121	Bad Paint Reaction tdipd @tdipd
	Jul 17, 2011 11:16:20 GMT Select Post Deselect Post Link to Post Back to Top
	Hi guys, painting my car here at the min, already did the shell with etching primer, U-pol hi-build primer, wet sand, dry, panel wipe, base coat (from alec orr, brand unknown), and max meyer 2k laquer. That all went grand But i've just tried painting my doors, wings and bonnet but immediately got a bad 'crackling' type reaction when i went to spray the base. Surface finish similar to a crunched up ball of tinfoil The only thing i've changed is by using 'pro-spray' hi-build primer this time. Is it possible this has caused the reaction? It has only reacted in places, not everywhere, do i Sand everything back to bare metal and try again? or flat the reacted area, prime that, and continue with base? Or would i get away with , flatting the reaction, and straight on with the base again? The panels are all from different cars so all have different standard paint under my primer.


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spongebob Part of things Posts: 108	Bad Paint Reaction spongebob @spongebob
	Jul 17, 2011 11:46:38 GMT Select Post Deselect Post Link to Post Back to Top
	Ive experienced this many times working in a bodyshop. Sometimes its possible to just sand off the reacted area and apply very light, dry coats of primer and let dry completely in between. But to be honest it doesnt always work and considering u don't know whats been on the other panels previously i would strongly recommend taking it all back to bare metal and starting again. You will also get a much better , smoother finish.


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spongebob Part of things Posts: 108	Bad Paint Reaction spongebob @spongebob
	Jul 17, 2011 11:48:40 GMT Select Post Deselect Post Link to Post Back to Top
	Also need to mention, make sure the primer your using is compatible with the paint your using. Idealy if you can Use 2k high build primer from a spray gun rather than cheap rattle cans. Hope this helps


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tdipd Part of things Posts: 121	Bad Paint Reaction tdipd @tdipd
	Jul 18, 2011 12:35:33 GMT Select Post Deselect Post Link to Post Back to Top
	Cheers Spongebob Problem found, and sorted. Looks like when I was flatting down before the colour base coat i must have sanded right through the hi-build primer in areas, right down to the etch primer (same colour as hi-build, so i didnt know i had gone too far). Solution: Flattened the reacted area and blew on hi-build again in 4 very light coats, giving loads of drying time between coats. Once dried I flattened again and began spraying on the base coat in extremely light coats before going for the normal procedure. No more reactions


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robg2 Part of things Posts: 815	Bad Paint Reaction robg2 @robg2
	Aug 1, 2011 19:23:42 GMT Select Post Deselect Post Link to Post Back to Top
	I've had similar stuff (albeit in labour intensive rattle can jobs). For me, the issue is essentially one of the top coats of cellulose base coat / lacquer re-softening a hi-build primer coat several layers further down. Not really sure why it happens, but I do know that it's only certain types of hi-build primer that suffer from this - other primers are ok. All very odd, and not exactly useful as the only solution is to go back through several layers of paint just when you thought you'd got it sorted!


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