Topic: Another rusty tank fix

[Shopdog]

I know there are several ways to dissolve rust inside these fuel tanks and it's been covered extensively, but I figured I would share this one because it worked better than expected. I used a couple gallons of Sunnyside Rust Remover from Menards. It was $21 (usd) per gallon and a very rusty tank was rust-free in 48 hrs. It also works as a rust inhibitor on a temporary basis, which resulted in zero flash-rust. I only used two gallons, which didn't fill the tank completely. I shook it around and rotated it periodically. I also didn't add any bolts, screws, chain inside to help as an abrasive.

[Stev-o]

Amazing!

[BomberMann650]

Good deal. 

[BenelliSEI]

That is an exceptionally good looking result!

[Shopdog]

I dried the tank out best I could by tossing a rag inside and rolling it around. Then, I used compressed air. I threw in about 1/2 qt of atf and sloshed that around to deter rust while I'm working on the outside of the tank and working on the bike ('75 cb550k). There's one golf ball sized dent I need to fix. It's just deep enough to need pulled before I start leveling with filler. I don't have a stud welder, but I do have a mig. I thought about tack welding a few nails around the dent and pulling it out. Or I could use jb weld, which would eliminate the chance of burning through. I don't think it'll take much to pull it, but it's in a bad spot where I can't get anything down through the filler opening.

[BomberMann650]

Lower amperage setting on the mig welder should be able to tack a nail to the surface.

I was welding thinwall stainless with 80amps.  Proper fusion, no blow out.  Maybe try 60a for tacking?

[Shopdog]

Lower amperage setting on the mig welder should be able to tack a nail to the surface.

I was welding thinwall stainless with 80amps.  Proper fusion, no blow out.  Maybe try 60a for tacking?

I'll try that. I'm not much of a welder, but I've been able to stumble my way through some pretty extensive sheet metal repairs on my old fox mustangs. These cars have really thin sheet metal in areas.

[GreaseMonkey]

That is very impressive. Never seen Sunnyside Rust Remover before.

Anymore inside tank after pictures?

[Shopdog]

That is very impressive. Never seen Sunnyside Rust Remover before.

Anymore inside tank after pictures?

Sorry, but I didn't take any other pics. I did borrow a scope and got a decent look down inside. It got every spec of rust, from what I could tell. I'm out of town right now, but I can take more pics when I get home Friday. The way these are made, it's pretty hard to get different angles though.

I saved the used product, as it says on the label that it can be reused. There's certainly no shortage of rust here in West Virginia lol! I'm sure I'll get more use out of it!

[Bankerdanny]

The $99 Harbor Freight pin welder is worth the cost when fixing up a tank.

[Shopdog]

The $99 Harbor Freight pin welder is worth the cost when fixing up a tank.

This is true. I've been looking for a reason to pick one up. Now that I think about it, one of my project cars has a couple nasty dings that could use it, as well.