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I tried out the vinegar on my MZ tank and I was pleasantly surprized at the result. There is still some rust in the tank but much less than before. I thought I might leave it at that and insert a filter in the fuel line and see how it goes

I guess the desired end product is an influential factor. Personally, I just want a functioning bike to ride.
$630 AUD plus not less than $60 AUD plus plus paintwork and rondels puts the meyer bikes option out of my consideration.

But, wouldn't you coat the inside before painting the outside?

Chuey

Chuey wrote: ↑Sun Mar 25, 2018 11:09 pm But, wouldn't you coat the inside before painting the outside?

Chuey

Depends if you need to repair the tank with heat I suppose.
Doing it yourself you could do a solder repair, then line the tank, then paint the outside. The local pro that did mine said to do the liner after the paint as the repair might damage a new liner. Seeing as it's a 3 hour return drive to collect I followed his advice.

I used three big bottles of toilet bowl cleaner in the /7 tank to remove rust. It was around 5% hydroflouric acid, same stuff included with the Kreme Koat kit. Left it in a couple days shaking it every now and then. Gave it a good rinse and dry. Maybe has been 15 years now; coating is still good. Think this prep is what KK needs to last.

My tank was real bad.
I took the tank for my 75/7 to a local guy to clean and paint the inside. That was a couple years ago.

I put gas in it a couple weeks ago and there are about 2 dozen bubbles forming on the outside. This is with 1 gallon of gas and letting the tank site and hang in different positions.

The guy said he would coat/paint it again, but I am thinking this tank needs to be scrapped. Maybe he can coat it and get it to seal, but I wanted to one day get the tank painted nicely. It seems like it is too far gone to risk spending any more money on it.

What do you think?

The shop I worked in coated vintage and classic tanks all the time. No matter what the brand of sealer, you should etch away the rust first. Usually a mild acidic solution works best (vinegar to muratic acid) left for hours to days. Then, add your coating to keep the rust from returning. These are best applied before any painting is attempted becasue all of them can be a real mess to work with.

In the US, after trying 4 or 5 brands, we are having the best success with a product called Red-Kote from local auto parts store.

Click to see Red-Kote

I used red kote. Easy enough to apply.

I di the strip and paint first on the advice of the painter. His concern was any heat or holes drilled to repair anything he thought would need repair would compromise any lining. I'm not convinced it mattered on my tank, but I did it his way.