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  #1 (permalink)  
Old 07-24-2012, 02:03 PM
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Powder Coating Tank Help

Looking for some expert opinions on how to save my custom tank. I had a local powdercoater do all my parts which turned out very good but the tank he is having lots of trouble with. He used JB Weld as filler and sanded multiple times with both primer coats and more sanding. The issue is that there are multiple pinholes and areas that are raised. Since this is a full custom bike I want a great looking tank. He seems at a loss and at this point I'm ready to just paint it. Any thoughts??
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Old 07-24-2012, 02:09 PM
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You don't use JB weld when powdercoating. JB is a plastic. You heat the powder (normally 400 degrees or so). JB will melt at that temp.

When you say primer coats, I hope you weren't talking about a paint primer. That too would be wrong.
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Old 07-24-2012, 02:17 PM
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I have read a lot about people using JB weld as a filler when powdercoating and they have had good results. If you dont recommend JB what else could I recommend him to use? Thanks
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Old 07-24-2012, 02:24 PM
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I actually think I've read that before too, Ras, but i know jack shit about powder. What i understood though was that people used it to dress/smooth welded areas before powder. ??
..the primer part dont sound rite to me either though, i always thought powder was applied to bare metal
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Old 07-24-2012, 02:26 PM
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I tried JB once - it started melting at 400. I was using Eastwood's Chrome powder, which requires 400 degrees, on a fender and it had lots of pin holes where the JB was. I read Lab Metal is OK but have not tired it. I prefer welding bad spots and grinding/sanding them smooth. Takes a lot longer but much better results.
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Old 07-24-2012, 02:29 PM
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Good info man...
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Old 07-24-2012, 02:43 PM
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Quote:
Originally Posted by 05train View Post
I have read a lot about people using JB weld as a filler when powdercoating and they have had good results. If you dont recommend JB what else could I recommend him to use? Thanks
Welding rod.
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Old 07-24-2012, 03:12 PM
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Check this stuff out. Might be a solution. EW Basic Lead Free Body Solder Kit with DVD
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Old 07-24-2012, 03:23 PM
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like said, JB is good stuff but not for heat.
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Old 07-25-2012, 03:13 AM
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the only stuff you can use is metal lab...jb weld breaks down under the high heat
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Old 08-07-2012, 08:39 PM
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Metal lab works great. JB weld(NOT quick) has worked for me when needed. No issues. Powder is plastic too. Powder only melts once(unless undercured), JB weld has never melted on me. Good luck!
Ross
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Old 08-08-2012, 04:03 AM
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My understanding of the PC process is the positive charge of the particles (paint) and the negative of the workpiece during the spraying process.....so, if plastic is used as a filler (jb weld), it will not adhere...
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Old 08-08-2012, 08:12 AM
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If that was the case second, third and fourth coats wouldnt work, because powder coating is plastic. Powder can easily be applied over JB weld. Ive done it many times with no issues.
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Old 08-08-2012, 09:43 AM
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Ross L - what temp do you normally cure the powder at? I don't use an oven (I do this at home), I use an infrared light - and when it hits about 400 the JB bubbles up on me.
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Old 08-08-2012, 10:31 AM
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Usually 400 ish. Never tried the heat lamps. I've applied multiple coats over JB weld so it could be in oven for 30 minutes or so, never had any problems. I've only used it very thin, to fill blemishes. Metal lab, is a proven product and no mixing.
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