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Old 05-28-2013, 06:51 AM   #1
TheOtherBart OP
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Filler for ~1/4" depressions?

I have a little CM200 that I bought off an inmate that I'm turning into a little rat cafe racer. Someone in the past had painted the whole thing flat black, so I'm just going along with the whole Mad Max thing.

The tank on these bikes originally had a hinged cover over the gas cap. This one is long gone (and I wouldn't want it anyway), but there are two big depressions in the tank where it mounted. I'd like to fill them but I'm concerned that whatever I fill them with would crack because of how deep they are. This whole bike is supposed to come in <$500 ready to roll, are there any cheap products that would do the trick?
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Old 05-28-2013, 01:40 PM   #2
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I think you should cut & weld in a filler piece.. Bondo that thick will just crack.
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Old 05-28-2013, 01:53 PM   #3
Maggot12
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Hard to picture, but maybe fiberglass or even jb weld.
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Old 05-28-2013, 02:21 PM   #4
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^Glass is what I was thinkin . . . . . .
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Old 05-29-2013, 04:51 AM   #5
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paintless dent repair??

basically a suction cup on steroids.
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Old 05-29-2013, 05:11 AM   #6
bill h
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try USC all metal
it is a modern substitute for lead.
some testimonial here

http://www.jalopyjournal.com/forum/s...8308&showall=1

yes, I have used it, on a 73 Alfa GTV I am restoring, and am happy with it.

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Old 05-29-2013, 09:33 AM   #7
TheOtherBart OP
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That's what I figured about Bondo, hadn't thought about either JB Weld of fiberglass. Welding in a patch would be the "right" way to do it I'm sure, but I don't weld and for this project I don't want to pay anyone to weld either.

I don't think the paintless repair would work because these are shapes actually pressed into the panel with fairly crisp edges. I'll try to snap a picture this evening and post it.
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Old 05-30-2013, 12:24 PM   #8
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Devcon would probably do the job. It's a metal filled epoxy. It comes in either steel or aluminum filled. You can grind / file / sand after it cures. Then touch up any imperfections with bondo. Sets up pretty hard & should hold up ok.

http://www.mcmaster.com/#devcon-adhesives/=mz81l6
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Old 05-30-2013, 02:46 PM   #9
Roland44
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Quote:
Originally Posted by TheOtherBart View Post
I have a little CM200 that I bought off an inmate that I'm turning into a little rat cafe racer. Someone in the past had painted the whole thing flat black, so I'm just going along with the whole Mad Max thing.

The tank on these bikes originally had a hinged cover over the gas cap. This one is long gone (and I wouldn't want it anyway), but there are two big depressions in the tank where it mounted. I'd like to fill them but I'm concerned that whatever I fill them with would crack because of how deep they are. This whole bike is supposed to come in <$500 ready to roll, are there any cheap products that would do the trick?
Fiberglass it! Quick, simple and it works..
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Old 05-31-2013, 08:45 AM   #10
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Originally Posted by Roland44 View Post
Fiberglass it! Quick, simple and it works..
I've done a little bit of fiberglass work in the past but just simple things like patching up a cracked canoe. Can you walk me through how you'd approach this? I'm envisioning sort of filling the void with fiberglass mat and then cloth over the top?
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Old 05-31-2013, 08:52 AM   #11
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Lead
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Old 06-01-2013, 06:34 AM   #12
H96669
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Quote:
Originally Posted by bill h View Post
try USC all metal
it is a modern substitute for lead.
some testimonial here

http://www.jalopyjournal.com/forum/s...8308&showall=1

yes, I have used it, on a 73 Alfa GTV I am restoring, and am happy with it.

Bill
Thanks...my friend needed that. He was thinking of leading that old Triumph tank but I think he'll go for that now. It can be powdercoated and is available in Canada. I think I'll pick some up anyway and give him the can then I can use it at his shop for my own projects and then get real cheap (too cheap) powdercoating done by him.
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Old 06-02-2013, 12:00 PM   #13
bk brkr baker
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I ordered some USC all metal right after reading this and i don't even have a need at the moment.
Trying to be prepared, what could go wrong ?
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