Tom400CFI

I've finished fab'ing my gas tank for the Vette Kart, it doesn't leak at all...but I want to be double sure that it won't. I want to seal all the welds from the inside of the tank w/something....I was thinking that I could mix up fiberglass resin and brush that on, but IDK if it will stand up to gasoline. Any ideas for this effort?

confab

How is RTV with gasoline?

I've taken rtv and rubbed it into welds in transmission pan drain plug holes from the inside as a quick backup.

Never had a leak develop.

confab

Red loctite might be a contender also..

WVZR-1

A good read likely, 2 of the 3 links at the end of the read work and a search for fuel tank sealant or sealer yields many products. Most any 2-part I'd think preferred.

http://www.vansairforce.net/articles/tank_sealant.pdf

Another product used by motorcycle guys

http://www.dimecitycycles.com/red-ko...ler-liner.html

Check locally and I'd think you have maybe some marina contacts for products used there. I used a guy for heavier truck fuel tanks that I'm sure used an Epoxy just because of the time he held the tank after his repair.

BlowerWorks

Be very careful - many sealants when exposed to gasoline or water over long time soften and fail !!!!!!! I experimented with same 20 years ago. One good product was Smooth-On but no idea how you would apply ? Whatever product you choose put some in a glass jar with gasoline. Personally I would not do what you are contemplating - the gasoline may dissolve whatever and contaminate your fuel system. There is nothing better than a good weld ! If you doubt your welding have a professional re-do !! Also - water will find most pinholes over time. Fill tank with water and let it sit for a week or so looking for the tiny leaks you are afraid of !!! Just my humble opinion ! greg

whalepirot

Eastwood and other restoration supply sources sell tank cleaners and sealants. Woould be great idea to use a cleaner before the sealant.

http://www.eastwood.com/gas-tank-sea...nk-sealer.html

As a side note (diff application) I learned that MIG welded A/C lines nearly always have pinholes (yeah, much higher pressure), despite a very experience welder. The specialy hose shop I use gas welds them. BOTH expert welders inspected visually, seeing no potential leaks, but the hose guy related the above.

s carter

I almost wonder if you could get it Electro-plated or Industrial Powder coated on the Inside like you would use on a Corrosive Tank.

whalepirot

Why reinvent the wheel with unknown result, versus a $45 proven product?

Aardwolf

The last one I worked on I did not use any sealants. I sprayed some weld crack inspection penetrant to find leaks and there wasn't any! It's a red spray that will leak through and show tiny cracks, I don't remember which brand I had.

Tom400CFI

Thanks for all the input guys! This was great.

I'm going w/one of the "proven products" that was suggested. It's affordable, for the purpose (location, chemistry etc)...should be a winner.


Like I said, the welds are already tested and leak free....I just want to overkill it.

LT1inaMGB

Best to just make sure the welds are liquid tight and don't use any sealers. Pressurize it with air and check with soapy water. Whatever you do don't use Bill Hirsch sealer, it peeled off the inside of my tank and plugged up the fuel pump causing an accident on the freeway.

Tom400CFI

Geezus....that **** looks like a plastic trash bag! Wow.

Thanks for posting. I may have to re-think this. Using soap in the water is a good idea.





.

whalepirot

I used the original teardrop shaped tank in a '55 Nash project ('93 Stang GT engine). I didn't use Eastwood's package (they don't sell junk) but in 6 years, no issues with the tank.

Worst case not sealing: R&R, hopefully w/o a fire!.

mako41

I don't know how big your tank is but I've used this stuff (Kreem) for rusted motorcycle tanks and it works great!

http://www.jpcycles.com/product/352-055

It's a three step process first remove rust then you etch the metal to prepare for the final heavy liquid sealer coating that is rolled around in the tank to cover everything.

I believe the inner surface preparation followed by the etching process to prepare the metal for the final seal coat leads to a long lasting lifetime coating that will never fail.

Here are some similar products that will do what you want as well;

http://www.jpcycles.com/motorcycle-gas-tank-sealers

confab

Oh wow.. I won't be coating my new tank I don't think..