Bunches of Custom Cars

So I bought a lot of matchbox cars to try to hunt for some gems, and I ended up getting a ton of custom cars. They look like they were painted by a child; they’re terribly done. Anyone have experience selling custom cars? Or anyone have any tips on how to refurbish these cars to their former glory?

The lot is all 1970 or earlier. Lots of great models, but I feel terrible just throwin away these cars. I feel like there’s something I can do with them