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Old 01-15-2007, 06:29 PM
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Can I Use Some Kitty Hair....?

okay so i cut out rust hole, replaced it with new metal...its all strong and well and all that but i accidentally blew a small hole in the seam with the MIG and dont want to try to fill it or something and make it even worse. can i just spread kitty hair over the area like i was going to originally but just have it gap the small hole?

its waterproof and its also got the fiberglass strands in it so i figure it should be just fine. this is no show car....its more like i desperately need to finish the body on my mustang so i have a car to drive...period....

what do you guys think?

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Old 01-15-2007, 06:42 PM
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Lets see a photo of what you are wanting to do.
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Old 01-15-2007, 06:59 PM
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okay, in the top left corner....

my digital camera has no batteries right now so i had to take it with my cell phone...it sucks but you can get an idea of the size of the hole....i haven't completely finished grinding it down but almost.
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Old 01-15-2007, 07:34 PM
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I would weld it.
However,You can use kitty hair in that area.
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Old 01-15-2007, 07:37 PM
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yeah...i would too if i looked at it "on paper" but im still not exactly a jedi master with the welder and the hole used to be even smaller until i tried to weld it then it just got bigger instead of smaller....i just dont wanna wreck it even worse.

i think im gonna see how the kitty hair works out. ive still got other patches i need to do as well.
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Old 01-15-2007, 07:46 PM
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I use Duraglass over all my weld seams.Should be waterproof,after all they make boats out of the stuff.
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Old 01-15-2007, 08:14 PM
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what is duraglass like....? similar to kitty hair?
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Old 01-15-2007, 08:19 PM
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if you use any kinda of fiberglass reinforced filler, use some long strand hair. this would give that spot more strength then short. Mike
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Old 01-15-2007, 08:21 PM
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yeah thats what im planning on doing. i figure if people can use it instead of metal in some cases, it should be good enough to gap some a pin hole.
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Old 01-15-2007, 08:46 PM
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Duraglass is short strand glass, probably like kitty hair.We used stuff call tiger hair back in the old days. Real long strand glass, hard to get all the air out of it. After you ground it there were a lot of pockets. Usg makes it I think.
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Old 01-15-2007, 08:51 PM
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My welding really kinda sucks, so I usually back my patches with fiberglass netting (the fine criss-crossed stuff..not the bigger helter-skelter stuff), using the normal liquid resin, after I weld in the patch panel. My stuff seems to hold together pretty well. A friend of mine (who had a body shop) once told me that it's real important to seal the seem from behind (if you can get there), as oxidation can attack from behind the patch, even more than the front. My method forms quite a barrier from behind. I usually put a second coat of resin on it the next day, after I run a coarse piece of sand paper over it to knock down any stray stiff fiberglass hairs. I use the small disposable chip brushes to work the resin & fiberglass. The kitty hair would work O.K. too, I would imagine, but why not seal the whole patch? I found that it also give the area a lot more strength, especially if the metal is already stressed & thin. This is only my opinion. I'm not involved with high level stuff. Life is too short. Good luck...Greg
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Old 01-16-2007, 06:01 AM
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you can get to the back side of that repair....seal it there

first choice: 2 part panel adhesive on a second inside patch, cover all the patch with enough adhesive that it oozes thru the burn thru......sand when cured and start filler

second choice, Duraglas from the backside with a spreader onto a roughly sanded surface till it oozes thru, epoxy on the duraglas to seal it

only a patch in that area didn't get all the rust and the welding hurt the surrounding metal, sand blast all the lower inside area and epoxy,

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Old 01-16-2007, 07:17 AM
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Use a piece of copper to back up the hole to weld. Slit a piece of copper tube and flatten the slit end,cut it off for a "handle" as long as you like back up from the slit end. Back up the hole with it and spot weld it up. Weld from the existing weld material back into the car metal with a longer stick out of the wire with quick spots is another way. The weld bead will absorb most of the heat and melt into the car metal without burning that up.
The short strand filler will be fine as your just filling a hole,not rebuilding structure.
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Old 01-16-2007, 06:22 PM
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Could you use a piece of Brass behind it and spot weld the hole shut, I remember using brass as the weld will not stick to the Brass.

Bart
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Old 01-16-2007, 08:09 PM
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one thing that i just thought of.... if you can not find any long hair fiberglass, go out and get some fiberglass matting. pull strands of the matting out and mix into the filler. well good luck!
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