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Old 12-25-2013, 11:59 PM   #1
Ducsmine
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Rusty gas tank. What do you guys use?

So I'm starting a resto on my newly purchased 1967 scrambler. Everything on it is really good, just a little surface rust. Even the original pipes are great! Only thing I need to do is remove the rust in the tank and seal it. The tank is solid just normal rust from 20+ years sitting. Heard a bunch of people using vinegar or a purpose built kit? I just want to get some opinions before I start. Thanks.
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Old 12-26-2013, 12:42 AM   #2
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I believe Ive heard baking soda
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Old 12-26-2013, 06:16 AM   #3
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Caswell coating to seal the inside after the rust is removed. Fill it with drywall nails and shake to break rust loose.
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Old 12-26-2013, 07:35 AM   #4
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Tons of good ways to do this.
Word of caution with the "fill it nails/screws" method. Go easy on it. Shake it too much or too hard and you run the risk of lightly dimpling the metal which would ruin your original paint. Also, this should really only be used when you have flaking rust, a little surface brownness won't go away with this method.
Otherwise, the easiest product to use is Evap-o-Rust, buy a gallon at Harbor Freight and pour it in, seal up the tank and let it sit for 24 hours. Roll it every four hours or so to get the solution on all sides and the underside of the top. Pour the liquid back into the original bottle and you ca reuse it on other things.
Electrolysis is neat, too. The drawback to this and the Evap-o-Rust is you then have to seal or coat the inside of the tank. A purpose made kit from Caswell or even Kreem has everything you need in one package to de-rust and seal.
I've personally used the electrolysis, Evap-o-Rust, and Kreem with decent results. Kreem gets a bad rap, and yes it looks like but it has held up for several years so I am happy with it. You have to be very very particular when using it, plus I let mine cure for about four months before using the tank, which I think made a huge difference.
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Old 12-26-2013, 08:53 AM   #5
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There are so many ways to go about doing this, for my Gs500 I bought 5 gallons of vinegar and let it set in for a week. It got great results. I then coated it with red coat(o reillys sells it), best 30 bucks ive spent. I was going to use evap o rust but did not feel like flipping the tank every couple hours and would cost way to much to get 5 gallons of the stuff(for me). I also tried the nails thing and it did little plus was a huge pain to get all of them out, still think one or two might have gotten coated, so I really don't recommend nails. Once you get rust you pretty much have to coat it so just do your research on what coat you want.
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Old 12-26-2013, 09:04 AM   #6
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Quote:
Originally Posted by Bigshankhank View Post
Tons of good ways to do this.
Word of caution with the "fill it nails/screws" method. Go easy on it. Shake it too much or too hard and you run the risk of lightly dimpling the metal which would ruin your original paint. Also, this should really only be used when you have flaking rust, a little surface brownness won't go away with this method.
Otherwise, the easiest product to use is Evap-o-Rust, buy a gallon at Harbor Freight and pour it in, seal up the tank and let it sit for 24 hours. Roll it every four hours or so to get the solution on all sides and the underside of the top. Pour the liquid back into the original bottle and you ca reuse it on other things.
Electrolysis is neat, too. The drawback to this and the Evap-o-Rust is you then have to seal or coat the inside of the tank. A purpose made kit from Caswell or even Kreem has everything you need in one package to de-rust and seal.
I've personally used the electrolysis, Evap-o-Rust, and Kreem with decent results. Kreem gets a bad rap, and yes it looks like but it has held up for several years so I am happy with it. You have to be very very particular when using it, plus I let mine cure for about four months before using the tank, which I think made a huge difference.
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Old 12-26-2013, 09:43 AM   #7
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Muriatic Acid to remove rust, then mineral spirits to remove acid, then red seal. Then your good to go for 10 years.
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Old 12-26-2013, 11:04 AM   #8
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Another alternative is POR15. We've used it for years with good results.
Don't order it direct, as they take a week before they ship it out, buy it from Summit instead.
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Old 12-29-2013, 01:30 PM   #9
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So I did the vinegar and dry wall screw process for a few days. I was surprisingly impressed. I really want to keep this tank as I'm keeping the original style of the bike. The tank does have a couple pin holes. Around the holes feels solid and is not completely rotten. I was wondering if anybody around here could braise it so I could use a sealer after. I'm up for any other ideas also as price and availability of a new/good tank are pretty high. Thanks.
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Old 12-30-2013, 11:22 AM   #10
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my buddy and I used "works" toilet bowl cleaner with bolts to knock out the rust and then coated the tank with "KREEM" tank kit.

great results.
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Old 12-30-2013, 02:25 PM   #11
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Quote:
Originally Posted by Ducsmine View Post
So I did the vinegar and dry wall screw process for a few days. I was surprisingly impressed. I really want to keep this tank as I'm keeping the original style of the bike. The tank does have a couple pin holes. Around the holes feels solid and is not completely rotten. I was wondering if anybody around here could braise it so I could use a sealer after. I'm up for any other ideas also as price and availability of a new/good tank are pretty high. Thanks.
Most of the kits cover/seal up the pin holes so it wont leak. Braising I think you have to repaint the tank.
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