I bought my 75 750F last year and have slowly been making her better.
However, the tank was far worse than I had thought.
There was a failed kreem coating over some nasty rust which of course will never work properly.
Following some online advice, I took it to a local radiator shop who put it in their boil out tank for a while trying to get the old liner out. It was there for weeks and he couldn't get it out. When I got it back, it was flash rusted from the acid bath they apparently do after the boil-out.
Not wanting to deal with it, I let it sit on a shelf for a while while I secured a replacement tank, which apparently was NOT from a 75/76 model super sport as the seller said, but was a later model which didn't fit. I didn't realize this until after the winter time when I decided to resume my slow project.
So, I decided to give the boiled-out tank another shot.
I got a gallon of M.E.K for the old failed kreemr, let it soak overnight and scooped out most of the old liner myself. There was still a lot of rust inside and out, so I put it in a plastic tote full of water and 'the works' toiled cleaner (20% HCl) to help with the rest of the rust.
After a week in there, it was pretty shiney most everywhere. I've was shaking it out with drywall screws when I decided to look inside to see how it was. I noticed that the daylight on the other side (I was looking through the top) was poking through little holes, not unlike looking at the night sky full of stars. I'm talking 30+ little holes all probably less than 1 mm with the largest close to 1 mm.
So, is my tank bfr, or will the por-15 that I was planning on doing take care of those? The POR documentation says that if the holes are 'large' then I will need to patch them with the provided cloth, which I did not receive in my kit. What exactly is 'large?'
My plan was to continue getting the rust and old liner out, and when ready, cover the bottom of the tank's exterior (that's where the pinholes are) with masking tape prior to coating the inside with the liner, with the intent that the sealer would then be stopped from leaking out (if that's even possible; I don't know how thick this stuff is) of said holes.
What do you think?
