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Old 12-18-2014, 01:31 PM   #1
flemsmith OP
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Will JB weld hold up to powder coat?

I want to use it to cover up some weld gaps in aluminum brackets I had welded before I take them to the powder coaters. Can anyone tell me if they've tried to powder coat over JB weld? If that won't work, and knowing I don't have a welder, or any torch other than butane, what advice can give me?

Thanks for any suggestions.

roy
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Old 12-18-2014, 03:38 PM   #2
74C5
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Let the PC guy know and, if needed, they might prime that area. JB is aluminum filled epoxy and as long as it is clean, plastics tend to adhere to plastics.

Edit: temp wise you should be ok by about 100deg F margin.
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Old 12-18-2014, 03:43 PM   #3
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JB weld and powder coat are not likely to work well together.
Powder coat often cures at 400 degrees. Aluminum and JB heated together will expand at different rates likely giving an uneven finish.
Powder coat also flows out with the heat.........it likes an even surface to flow evenly.

JB steel stick might work better ??????

"Lab metal" is recommended by some powder coat suppliers. I have never had good luck making a flaw free surface after PC.

http://www.eastwood.com/hi-temp-lab-...arent_id=49569

Let your powder coat decide.........if you need a flaw free surface finish. He is likely to have some product he has had good results with.
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Old 12-18-2014, 04:22 PM   #4
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While Lab Metal is preferred, I have used JB Weld (Original, NOT quick set) with GREAT SUCCESS as filler before powdercoating.

There are a few steps involved however.

The depth/size of the pitting, scratches, or imperfections that need "filling" will determine the procedure.

If just a few shallow pits, I apply the JB weld, let it sit for 24 hours then sand/blend into surrounding area, just as you would Bondo.

I then have the part epoxy/powder primered before final color coat. Sanding the primer with 500 grit. Small amounts of JB weld do not seem to shrink or outgas enough to matter, and I cannot ever recall having an issue...And i've had hundred (thousands?) of pieces powdercoated in the last 15 years. As a matter of fact, I was at the PC shop again today dropping off another load. Pretty sure I've helped put my PC's kids through college..lol

Deep, large areas I will fill with JB Weld, and "Pre-Bake" the part to allow the JB weld to cure/bake/outgas. Large areas tend to shrink a bit so another sand is then necessary.

Then Primer

Sand

Final Color Coat(s).

Once again, Lab Metal is better, but honestly not by much IMHO if you take your time.


And finally, if you are trying to achieve a "paint like" smooth finish void of orangepeel, etc, you absolutely CAN wetsand and buff powdercoating. It doesn't work as "easily" as auto paint, but a bit of elbow grease can lead to a finish that is ridiculously flat and deep.

If the PC was laid on thick enough (but not too thick), you can sometimes even clean up minor blemishes that were not addressed in the initial prep or priming of the part.
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Old Yesterday, 07:49 AM   #5
flemsmith OP
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Thanks for inputs. I think I might try some of this brazing material. I'm not after perfection in looks, I just want to add a little more strength/support. Two brackets that are sort of cantilevered to mount my sidebags. One of them has already cracked in the welded area.

http://www.aluminumrepair.com/
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