I've tried sanding, I think it would be easier to buy a new frame

Go to WalMart and get some spray on paint stripper. Let it sit a few minutes and most of the paint will fall off, use a wire brush to get the rest off. One thing for sure, do NOT get any of that stuff on you! It will eat through your skin fast. Just the overspray will burn your skin, this is some bad stuff. Makes the job much easier as long as you protect yourself.