I am so pissed about this and I don't even know what to do. I bought an unfinished wood filing cabinet. It wasn't cheap, but it was cheaper than it would have been if I'd had it professionally painted. So I primed and painted it white. It looked lovely so I sealed it with "clear" polyurethane. That was a week ago and the poly has turned it yellow. It looks like that nasty yellow that furniture gets from being in smokers homes. WTF do I do now? Do I have to strip it and start over? Can I just paint another white coat over the poly and then use a different brand of poly (or some other product) and hope that doesn't turn it yellow? And also, can I go down to Miniwax and kick someone in the balls because I am so pissed that their "clear" product is apparently anything but.