Bugger mate not good what paint did you use the brand?....My carby to tank was the same but the fuel did not worry the paint,all I did to fix the leak was to make a thicker gasket you could try two gaskets but with the thicker gasket mines fine now..The tank to carby is not what you would call very flat...Good luck and mower is looking great are you doing the catcher as well.....Cheers Chris