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  #1 (permalink)  
Old 08-24-2011, 03:03 PM
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What's The Point Of Sealing A Gas Tank

so i've got a peanut tank that came with my roller. i have already pressure tested it awhile back and there were no leaks. i'm ready to get my paint done and was about to seal the tank when i realized there was a reddish/pinkish translucent coating on the inside. after reading the forum and goggling some pics it appears to have been sealed with Red-Kote. i have a KBS coating 3 step kit and am considering removing the Red-Kote and re-coating with the KBS kit.

my reason for re-coating would be inconsistent thickness of the Red-Kote (it looks a little thin by the petcock area), and there appears to be some rust under the Red-Kote on the center tunnel.

i want to know if the reason for sealing a tank is to make sure it doesn't leak or is it to prevent rust?

----->Inside of Tank Video
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  #2 (permalink)  
Old 08-24-2011, 03:37 PM
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I'v never sealed a tank and have NEVER had one rot on me because I use my bikes everyday for the last 35-40 years...from what I'v seen they only rot if they are not used and water gets in and has time to rust.......and it does take years for a tank to rot through

also with the alcohol addatives they are now using in fuel a lot of tank sealants dont work...the addatives actualy rot the sealant that then can totaly fuck your carb and motor up..
...it evens fucks fibreglass tanks!!....if ya use it...be VERY VERY sure it wont wreck ya bike in the long term...........
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Old 08-24-2011, 04:17 PM
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I never sealed a tank either and never had a prob. when a fabber seals a tank its a bad moon a risin sign
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Old 08-24-2011, 04:39 PM
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This is what the addatives did to a tank I bought last year on ebay....
what ya see ain't rust it's melted tank sealant.....once removed i cleaned the insides up with wet and dry, oiled it and have used it with no probs since...

I will NEVER seal a tank!!
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Old 08-24-2011, 04:43 PM
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wow that was a mess
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Old 08-24-2011, 05:10 PM
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Quote:
Originally Posted by magnum45pete View Post
This is what the addatives did to a tank I bought last year on ebay....
what ya see ain't rust it's melted tank sealant.....once removed i cleaned the insides up with wet and dry, oiled it and have used it with no probs since...

I will NEVER seal a tank!!
no shit!!! thanks for sharing this. never would have thought of this
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Old 08-24-2011, 05:37 PM
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Quote:
Originally Posted by magnum45pete View Post
I'v never sealed a tank and have NEVER had one rot on me because I use my bikes everyday for the last 35-40 years...from what I'v seen they only rot if they are not used and water gets in and has time to rust.......and it does take years for a tank to rot through

also with the alcohol addatives they are now using in fuel a lot of tank sealants dont work...the addatives actualy rot the sealant that then can totaly fuck your carb and motor up..
...it evens fucks fibreglass tanks!!....if ya use it...be VERY VERY sure it wont wreck ya bike in the long term...........
+1 on that
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Old 08-24-2011, 06:07 PM
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That red sealer looks like the kind of sealer radiator shops use have seen tanks treated by a local radiator shop around my town. Know a few guys that had them treat their tanks. One is a relative of mine he has been wrenchin , and painting for a few years and he swears by it. Pretty much everyone in town goes there. I know he has a set on his bike that was treated back in 98 and hasn't had any issues. It's a red transparent coat suppose to resist everything and stop rust to. So you might want to check out a good radiator shop and have them take a look . I had mine done on a set of drag specialties bare metal tanks about 4 years ago haven't noticed any problems . Traded the bike a month ago but a friend still has it.

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Old 08-24-2011, 07:00 PM
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I didn't seal my tank either. I put gas in it and it didn't leak. Done. If your going to store it for awhile just make sure it's filled up to the neck and your good. No need to seal a tank if it aint leaking.
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Old 08-24-2011, 11:07 PM
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i guess i'll just leave it and whatever happens, happens. it's not leaking and i don't plan on using any additives.

the Red-Kote data sheet says: "Red-Kote is resistant to methanol. In the U.S. the federal government allows a maximum of 5% of methanol. Red-Kote is not affected by up to 10% methanol. Greater than 10% methanol will leech the red dye out and turn the fuel red, but the Red-Kote remains tightly bonded to the metal. Some fuel tank liners are dissolved by methanol into sticky lumps and strings that plug the fuel line. This will not happen with Red-Kote."

http://www.damonq.com/TechSheets/Red-Kote.pdf
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Old 08-25-2011, 02:48 AM
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talking of rust and tanks, i'm just building a 71 CB500/4, it needed a tank and I managed to find one at a spares dealer here in the UK - he gets all his stock from the US (he has around 10 containers of bikes and bits come into the UK every month or so) anyway, this tank apart from some dents looked absolutely immaculate inside and absolutely no sign of rust - not bad for a tank that is 40 years old, goes to show, look after your tank and it will last its course.

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Old 08-25-2011, 04:15 AM
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Ouch

I have a set of panhead tanks with the spiral fuel tap and hand change on the left tank that have been sealed with something bad as I have to clean the fuel bowl of crap every hundred miles or so .....so I rekon the tanks will look like magnumpetes when I get em off in winter .....not looking forwards to cleaning or cutting into them ......

if it dont leak ........pases a pressure test ......leave it
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Old 08-25-2011, 08:35 AM
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Look around for the truth

I know of no manufacturers of motorcycles that seal their gas tanks, which ought to be an indication of what they think sealing the gas tank is worth.

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Old 08-25-2011, 08:48 AM
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I believe it has more to do with the materials used and the manufacturing process. Back 30 years ago I never heard of anyone sealing a stock Harley fuel tank. But now if you look in the various parts catalogs at the aftermarket offshore manufactured tanks it usually says they (the parts distributor) recommends sealing. That's why I put a set of older stock Shovelhead fatbobs on my bike, even though I had to fix some dents in them, and they've been fine.

If running something like a Peanut or Sportster tank I'd try to find an older USA built tank at a swap meet or on Ebay and stay away from the overseas reproductions.

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Old 08-25-2011, 09:07 AM
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ppl can say what they want about HD but they make some godamn good parts or I should say they USE to. I've seen soooo many parts 50 75 years old just as good as new.
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