Ok, I have an issue with my paint - it looked lovely for the nine months it was wrapped up in my spare bedroom, but three weeks after putting it on the bike it looks like this:

I'm guessing theres a pinhole in the tank and the petrol vapour is forcing the paint away from the tank - does that make sense? Think I should be able to get the guys who did it to redo it without addtional payment? I handed over what I thought was a solid tank, I was told (after they'd painted it) it was covered in holes especially around the tank badges (where they'd dug out filler) but that it was ok as they'd sealed the tank...
Opinions gratefully received....
Stu