Motorcycle tank repiar?

[Chipped tooth]

A Friend of mine pulled a boner move on his bike, put to long of bolt in a place where a short bolt was supposed to go.

It put 2 holes in the tank behind the steel tab with the threads.

He used JB weld to fill the holes and it's working so far but will the JB hold?
I don't want him or his bike going up in flames !!!

I have never had any luck with JB and fuel.

Tank is clean no rust, not that old of a bike.

Looking for more of a permanent fix, New tank is insanely priced.

[Greenlight]

If there is no rust, can you TIG weld it or braze it?

Several companies make gas tank repair putty. I have used this will good success.

http://www.walmart.com/ip/22296322?wmls ... 31&veh=sem

[Chipped tooth]

I could probably Tig it but I don't want to ruin the paint.

It's gonna sit over winter with gas in it and see if it holds

[dave brode]

This would seal over the jb, I bet. It works well. 8oz would be more than enough. Fwiw, I do two coats, back to back.

http://www.por15.com/POR-15-Fuel-Tank-Sealer_p_64.html

[Chipped tooth]

Thanks Dave, I'm guessing this coats the inside?

I wonder If it could be applied outside over the existing patch?

[dave brode]

Thanks Dave, I'm guessing this coats the inside?

I wonder If it could be applied outside over the existing patch?

Yes, inside. It would not work outside. They sell a complete kit, etching cleaning etc, it's normally used on old rusty tanks. Iirc, they have a patch mat'l too. Afaik, the etching product is phosphoric acid. I'm cheap and just buy the coating. I've used concrete cleaner from home depot on not too rusty tanks. Followed by cleaning with purple power etc, hair drier after. You can look at their msds for a clue. I will say that with the phosphoric acid, the tank gets mighty warm.

Repeat: they don't recommend it, but I do two coats. I've done it several times with good results, including an old model T Ford tank. The stuff is pretty thin. Looks like metallic silver paint. Pour can in, slosh around for 1/2 hr, pour out. Repeat right away. It's good only for a few hours after can is opened. They say not to let it puddle, but I had it puddle, 1/2" thick or more in the bottom. Was still in there just fine after two year+.

Dave
p.s. - I had a quicky patch of fiberglass body repair stuff on a gas tank hold for years.

[Chipped tooth]

I have done the quick patch before and it's holding still 3 years later, on a friend's RV.

This bike is efi with a module in the tank, I suppose I could pull the module and work the stuff around concentrating on the puncture area.

[dave brode]

info from garage floor thread. Would work as well or better than the concrete cleaner that I've used

http://www.homedepot.com/p/Klean-Strip- ... escription

[Chipped tooth]

Thanks Dave

What's a guy use to get bad Varnish out of a tank from the 70s?
No rust just flaking heavy varnish..... I have never seen one like this.
It looks like molasses was spread around and let get hard.

So far Acetone and then Super clean hasent touched it

[dave brode]

I 'spect that the phosphoric based stuff would cut it, that stuff is pretty nasty. I had dirty tanks that I fixed cleaned at a radiator shop [not sure what they use] and followed with phosphoric, then purple power, hair drier, then the coating.

Dave

[Kevin Johnson]

Cough, cough --- probably highly illegal now --- cough, cough.

http://www.google.com/patents/US1113971

[Chipped tooth]

I would throw it in my hot tank if the paint wasn't good.

[Kevin Johnson]

Thanks Dave

What's a guy use to get bad Varnish out of a tank from the 70s?
No rust just flaking heavy varnish..... I have never seen one like this.
It looks like molasses was spread around and let get hard.

So far Acetone and then Super clean hasent touched it

Sounds like a different tank from the original post. Are you sure that the bad varnish is not actually a previously applied coating? That would jive with it being difficult to remove.

[Chipped tooth]

I don't believe so, it only covers a little better than half the inside.

I was thinking of trying the airplane paint remover.

[dave brode]

Thanks Dave

What's a guy use to get bad Varnish out of a tank from the 70s?
No rust just flaking heavy varnish..... I have never seen one like this.
It looks like molasses was spread around and let get hard.

So far Acetone and then Super clean hasent touched it

Speaking of molasses, you can find info on guys using feed grade molasses for rust removal. Hmmmm.

I've not tried it, but maybe it would do well on a tank? The molasses is said to work well on internal passages of heads/blocks and such. I have done the battery charger/washing soda [sodium carbonate], which works better with a little lye added, btw. Sorry for getting off topic, but the electrolyte and current works only with line of sight. Not so with molasses, afaik.

Dave