My petrol tank sprung a leak, only a pinhole.......but when i cleaned up the area, I found this:-
So cut that bit out and welded in a made up patch, then cleaning up the section to put the double skin bit back in place, the wire brush opened a few more pin holes!
Welded in another patch section and applied rust treatment prior to testing with some petrol to see if it leaks now!
Then will coat the inside with tank sealer to cover the areas affected by the welding internally.
Takes a long time doing this, keep having to wait for things to dry! Rust converter, tank sealer, paint!!!
John