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21 I spent a fair amount of time trying to weld the pinholes in what was definitely the thinnest area of the sheetmetal, eventually admitting defeat and taking it to a radiator shop, who leaded over my repairs and pressure tested the tank for $25! Although I intended to seal the tank, I wanted to ensure it had no leaks beforehand. You can see here I'd also cut the sight gauge tubing. Also at this stage I scraped off the underseal that had previously been brushed on the exterior, repaired the few dents, and knocked down a couple of ridges (really edges of large depressions) as once the sealer is in and hardened, you don't want to be hammering on the tank.