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Originally Posted by Kerthan23

Many years ago I got told by an old engineer that I worked with, cattaloy, filler is best, I ran over something with our then mg metro and it put a perfect 5 pence hole in bottom of tank and used filler and didn't even cover hole just filled it as a temp measure to get to work on the Monday and 2 years later was still holding
Did the seam on a mates rover 214 and that was perfect for years, another mates seat Marbella (fiat panda) side & seam lasted years, the trick is it must be fully dry and I cleaned it back to bare metal to see the holes and show others that will appear, Done a few motor bike tanks same way, hope this helps

I have used cattaloy on an engine sump. I emptied the oil out used brake cleaner to remove any trace of oil and it was till ok when the owner sold the car 18 months later. As has been said it needs to be completely grease free but it sticks like the proverbial to a blanket.