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Old 09-27-2006, 09:51 PM
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Powder Coat Preperation

I know you can't use Bondo (plastic filler) to smooth welds, fill voids, etc. But does anyone have any suggestions for what to use for surface preparation prior to having a part powder coated. I've called several local powder coat guys and they say use brass. I have a 9" housing that will be very visible in the car its going in and I want it pretty. The old round back housing is in good shape but the factory welds are too unsightly and the dish on the rear of the center section needs some attention before I send it to the powder coat man. Is brazing the answer? I've heard that the metal fillers such as Devcon liquid steel is not advised because it can crack and fall out after the coating. Same for any non-metal filler. Guess its time to drag out the torch and brass rod? I know also that too much heat can warp the housing so if brazing is the only answer I'll need to do that before I send the housing to the shop for narrowing.

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Old 09-28-2006, 05:23 AM
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powder coat surface prep

I'd blast the housing clean and use my mig welder to fill the voids and then grind it back down. I agree with doing it before narrowing but keep any work away from the ends as when it's narrowed most of us do it from the ends and don't want any filler in the way when we replace the ends. Also you need to have the brackets on before the housing is narrowed to keep it from warping when you weld them on.
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