woohooo found a place here in toronto that does hot acid flushing $50cdn so wont need repaint other methods aint been working, cause harly any rust the gad varnish is so thick it has protected tank and looks like a previous owner poured in tank liner over the varnish so it beaing a biatch to remove had phospheric acid in it for 3 hours not much notice(acid over diluted to be gentle to tank, kream ethcing acid did nothing electrolosys cleaned my filler port only, tuesday going take tank and get it acid flushed.