Paint Defect
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Sprayed some panels a while ago on a slowly moving project. Paint is metallic/pearl blue in 1k base and clear. I can see what appears to be like the metallic particles have joined up in lines, if you catch the right angle. I don’t think it was like this when I initially sprayed the panels, may be it’s happened over several months?
[IMG]http://www.readresearch.co.uk/personal/mig-welding/paint_defect.jpg[/IMG]
I don’t think it’s crazing in the clear, looking straight on the panels look perfect. I’ve done both front wings and a rear quarter and they all show the effect. The panels were all done weeks or months apart and the quarter and one wing used a different tin of base, probably different tin of clear too.
Any ideas?
Just curious – The lines all seem to be going in the same general direction. is this the same direction you were spraying?
No, I was moving the gun from front to back along the wing.
I’ve had that happen to me and it was in the clear I put activator twice instead of hardner and activator the activator can looked just like my hardner can i grabbed the same can twice it looked good for a few months guy brought the car back and had to strip off the parts I sprayed and redo
There is no hardener, it’s a 1k clear lacquer and it’s supplied ready to spray.
I had another look over the car last night. The bumpers I did are also showing the problem, but not as obvious and the pattern is more like crazing or spider webs than the lines on the wings.
I’m thinking you needed a hardner all the single stage paints I’ve sprayed I’ve had to put a hardner in them I would talk to your jobber
[quote=”richie00boy” post=31928]There is no hardener, it’s a 1k clear lacquer and it’s supplied ready to spray.
I had another look over the car last night. The bumpers I did are also showing the problem, but not as obvious and the pattern is more like crazing or spider webs than the lines on the wings.[/quote]
There is your problem. Lacquer will do that at times. you need to use a good 2k automotive clear
Makes you wonder how manufacturers ever got cars out of the factory 25 years ago. Surely there must be some other factor affecting the finish?
[quote=”richie00boy” post=31946]Makes you wonder how manufacturers ever got cars out of the factory 25 years ago. Surely there must be some other factor affecting the finish?[/quote]
surely there are, but in 2013 there is no reason to use a 1k lacquer clear on a car unless you are doing a period correct restoration. you likely piled it on to heavy too fast and when all the solvents finally evaporated and the paint shrunk, it cracked.Well there is one very good reason, isocyanates. I’m a home sprayer in my garage.
I did take care to observe flash times (15 minutes) and not put on too thickly or too many coats (3). Weather was good too. Perhaps it is some kind of micro crazing though and the metallic particles reflect it so at some angles it jumps out. Be nice to try and find the root cause though, as I believe I did follow the instructions pretty well.
I have been researching paint defects and am wondering if I am suffering from dissolution or migration? There is no cracking, it seems to be that the metallic particles are affected. My first coat could have been not a light tack coat, more of a gloss coat. I wouldn’t say I ever applied a heavy coat though.
I’m not seeing the problem on some other (plasic) parts that I painted though.
the problem lies in the fact that it was a 1k product heat tends to just r*pe those products and cause it to shrink
sounds to me like sanding marks showing
Sanding was done perpendicular to those lines though.
I’ve seen lines in paint (not cracks) when pre cleaner is not thouroly wiped off and base is put on to wet. Almost like stripes of fish eye but in stripes because of the wiping marks. Just a thought.
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