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Old 06-03-2009, 09:02 AM   #1
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Thule Roof Box Repair


I am new to Automotive, but have posted on this forum before.

I recently dropped my Thule Evolution roof box, causing a vertical 4 inch crack on the edge of the lip. Looking at a hardware store, I bought a fiberglass repair kit, and an "all plastic" epoxy. I intend to sand the inside of the box, apply epoxy over a piece of fiberglass. Will it work? I think the box is made of ABS.

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Old 06-03-2009, 09:42 AM   #2
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Thule Roof Box Repair


Yes, Thule uses ABS. Your epoxy might work, but it would probably be easier to just pick up some ABS glue from a hardware store. It's a solvent weld vs a glue and actually melts and rebonds the plastic. You should back the crack with a piece of duct tape so the glue doesn't run through onto places you don't want it. That technique is used a lot on ABS dirt bike parts.

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Old 06-03-2009, 03:06 PM   #3
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Thule Roof Box Repair


I've had good results using Plumbers Goop. http://wiki.answers.com/Q/What_is_plumbers_goop
They also make specialty Goops, for taillight repair and other stuff, but to tell you the truth it is likely the same formula in a different package.
I use it for repairing the bumper end caps on my Jeep and a hundred other plastic repair uses.
You can also use a little fiberglass mat as backing, but in my experience the Goop is strong enough by itself if piled on a little behind the repair where it doesn't show. Just sand a little so it gets a good bond, maybe wipe it down with a good solvent, I use Acetone.
The only real trick to using it is, it takes awhile to set and may tend to flow away from or down the crack or whatever. I use gravity and prop the piece to be repaired up, with the crack or whatever down.
Good stuff, try it you'll like it.

Fiber glass (polyester resin) will also likely get the job done, mixing it is an art. The amount of hardener to be used can vary widely depending on the outside temperature. Too little and it may never set up, too much hardener and it can set up before your finished. If it gets way too much hardener it can get really hot and the epoxy will discolor. It will pretty much destroy any paint it drips on or be next to impossible to remove. I tend to use JB Weld a lot for small repairs, it is easier to use and is not as brittle as straight polyester.
You can also get Polyester body putty with fiber mixed in, which might be ideal for what you are doing. It is fairly thick (does not run much), sets up quick, a little more forgiving in mixing (hardener) and nearly as strong as polyester resin with cloth.
Polyester resin and cloth can be a bit hard to work with, it takes a little practice IMO.

Last edited by Bigfoot; 06-03-2009 at 03:32 PM.
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