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Old 05-04-2015, 01:05 PM   #1
arturo3rd
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Dent in tank

Picked up a larger (to me at least) gas tank from ebay and need to remove a dent. Before I paint it and cover it with mud, any ideas on how to remove the dent.

Ive seen videos on YouTube using the hair drier and dry ice, etc but any advice on other techniques based on the dent location by the crown?
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Old 05-04-2015, 01:08 PM   #2
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The dry ice thing is bogus bullshit. You're either going to have to weld some studs on it and pull it out or strip it and fill with bondo. However, since it's going on a Harley rattle trap I'd advise against the bondo route.
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Old 05-04-2015, 01:31 PM   #3
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I have pulled it with studs in the past. It isn't easy. That dent isn't going to be an easy out. It is in a hard spot being in the curve. When I did the studs, the tank was so thin that it ripped holes in it. I then had to braze it over to seal it before smoothing it out. If you can find a PDR guy, that may be the best option. They have tools to access this from the inside.
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Old 05-04-2015, 01:49 PM   #4
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Put a sticker on it.
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Old 05-04-2015, 01:51 PM   #5
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Don't waist your time fixing that little dent. Even if you push the majority out, the finish is kinked and will show. It will still require a full repaint and new decal.

Think about it - You're losing about 2 teaspoons of gas, if that. And the way gas expands and contracts with temperature - it's impossible to tell any difference.
Fill your tank to over flowing on a sunny day. Park it in your garage over night and it will cool and shrink. It the morning you[ll see it's below the splash guard inside the tank.
Sand it down to metal. Clean it. Coat it with fiberglass resin first and press it onto the metal with a rubber gloved hand. Work it into the metal good.
Before it sets - Fill it with fiberglass resin and the non-woven sub-straight.
Leave it a little shy of completely filling the dent. If you do overfill - just sand it down later after it sets.
Some sanding may need to be done so it doesn't look like the surface of the moon.

After it sets, (we use a heat gun to get it started) but after it sets, re-glass with woven mesh to very close to the shape you need.

No - it won't crack.

Use only a small amount of glass resin or thin coats of scratch filler to give it the final shape. You might need to repeat this a couple times to get it perfect.

There's no need to spend time or money on a ding like that because you are only losing about 1% of internal volume.
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Old 05-04-2015, 01:54 PM   #6
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I don't think he's as worried about volume as much as he is his tank looking like , lol.
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Old 05-04-2015, 02:51 PM   #7
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I was going to put a sticker over it. I emailed a PDR guy I found here from a search.
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Old 05-04-2015, 02:55 PM   #8
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Quote:
Originally Posted by arturo3rd View Post
I was going to put a sticker over it. I emailed a PDR guy I found here from a search.
Looks like a handlebar dent.
Find a piece of pipe. Line it up on the other side and smash it in with a hammer.

Looks like it's supposed to be that way-
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Old 05-04-2015, 03:52 PM   #9
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Quote:
Originally Posted by Track_Graphics View Post
Looks like a handlebar dent.
Find a piece of pipe. Line it up on the other side and smash it in with a hammer.

Looks like it's supposed to be that way-
Brilliant!
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