Go Back   ADVrider > Gear > The Garage
User Name
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 12-18-2014, 01:31 PM   #1
flemsmith OP
Joined: Apr 2006
Location: Apache Junction, Az
Oddometer: 573
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.

flemsmith is offline   Reply With Quote
Old 12-18-2014, 03:38 PM   #2
Studly Adventurer
74C5's Avatar
Joined: Aug 2008
Location: El Dorado Hills, CA
Oddometer: 921
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.
R1200RT (R1100RT gone)
KLR650 - gone
Don't be the guy who needs to pee on the fence to figure out that it's electrified.
74C5 is offline   Reply With Quote
Old 12-18-2014, 03:43 PM   #3
Beastly Adventurer
Joined: Jun 2007
Location: Wausau
Oddometer: 1,868
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 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.

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.
1982 CX500 Turbo ,2006 ST1300, 2012 NC700X
1971 CT90,1981 C70, 1986 TRX 250,
1993 TRX300 4X4, 2001 TRX500 4x4, 1987 XR250L

showkey screwed with this post 12-18-2014 at 04:02 PM
showkey is online now   Reply With Quote
Old 12-18-2014, 04:22 PM   #4
Gnarly Adventurer
Joined: Feb 2010
Location: where I am supposed to be.....
Oddometer: 113
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

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


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.
Electric start?

scrambler73 screwed with this post 12-18-2014 at 04:28 PM
scrambler73 is offline   Reply With Quote
Old Yesterday, 07:49 AM   #5
flemsmith OP
Joined: Apr 2006
Location: Apache Junction, Az
Oddometer: 573
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.
flemsmith is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Times are GMT -7.   It's 07:09 AM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014