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Unread 04-20-2014, 08:59 PM   #1
katuah
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How to get flaking paint off powder coat? (Bumper)

Hey this may be a n00b type question but you gotta learn somehow.

I bought a used bumper and as I'm cleaning it I realize that not only is there about 3 layers of paint on it, at least one of the previous painters did not clean the thing before he sprayed it. Ungh. Now the paint and greasy dirt is flaking off, down to the original powder coating in many places.

I just spent the afternoon scraping the bigger flaking areas with a plastic putty knife and it now looks kind of.... mangy. So here's my question: What kind of tool can I use to get the rest of the old paint off, but not rip up the powder coating underneath? The putty knife just isn't doing it, and I don't want to take a wire wheel to it cos that will just shred the powdercoat too. Is there something else like that, that is gentler but still has some scouring power?

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Unread 04-21-2014, 01:28 AM   #2
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Careful sanding or just strip the whole thing down to bare metal and prime it which is probably less work and much faster than the former option.
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Unread 04-21-2014, 10:36 AM   #3
katuah
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Not too worried about "less work and much faster." In my experience, factory powder coating is usually really durable, much moreso than I can get with rattle cans. I'd like to retain the powder coating if at all possible.

I may see if a polisher wheel would work.
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Unread 04-21-2014, 10:51 AM   #4
TennesseeYJ
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Assuming you are trying to leave the powder coating for metal protection? If so, depending on how cheap the rattle can paint is, easy off oven cleaner will remove some cheap spray paints. Next step up will be acetone. These will fade the surface of the powder, but shouldn't remove it (depending on what type of powder was used). If you get to the point you don't care about the Powder coat staying on use Permatex Gasket Remover. That stuff will roll powder and all off! There is one exception, I was prepping for powder a Ford FI intake one time. I don't know what that paint was but nothing short of a grinding pad was taking that stuff off!! LOL
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Unread 04-21-2014, 11:00 AM   #5
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Quote:
Originally Posted by TennesseeYJ View Post
Assuming you are trying to leave the powder coating for metal protection? If so, depending on how cheap the rattle can paint is, easy off oven cleaner will remove some cheap spray paints. Next step up will be acetone. These will fade the surface of the powder, but shouldn't remove it (depending on what type of powder was used). If you get to the point you don't care about the Powder coat staying on use Permatex Gasket Remover. That stuff will roll powder and all off! There is one exception, I was prepping for powder a Ford FI intake one time. I don't know what that paint was but nothing short of a grinding pad was taking that stuff off!! LOL
If you are going to strip the paint totaly,next time try the aircraft paint stripper..its made to do what you want when stripping paint,its a paint stripper...............
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Unread 04-21-2014, 11:17 AM   #6
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If it's very low end spray paint even mineral spirits may soften it without damaging the powder coat
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Unread 04-21-2014, 11:23 PM   #7
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Try "Peeler" its a stripper designed to remove de- lam clear and leave the E-coat/ under coat. Acetone is another option.
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Unread 04-27-2014, 11:00 PM   #8
TennesseeYJ
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If you are going to strip the paint totaly,next time try the aircraft paint stripper..its made to do what you want when stripping paint,its a paint stripper...............
Normally I would agree with you. I've used "Aircraft Stripper" several times on "wet" paints with many times success. Some powders it works on. I have run across many powders, if cured right, Aircraft stripper just dulls the finish. I've left parts coated and even submerged, just dulled the finish ... good powder coat is tough stuff!!

Been shooting my own powders for many years and I have had to strip other bad paint jobs or occasionally I get a bad part due to outgassing or faraday causing thin spots. A few years ago I finally made enough money to upgrade my powder coating gun to a 100K volt unit (adjustable) and adjustable pressure (powder flow). A lot less stripping of part parts every since!
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Unread 05-03-2014, 11:08 PM   #9
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