get back to my comment - now that I talked about it, but not done it in decades, I feel like doing it again - the stuff with the textures!
I had bought paintings in fleamarkets before (also long ago) but mostly for the frames. Not knowing the chemistry of the paint though, I never used the canvas (only the stretcher), and just tossed it - and no, I know what is good, but these were boot-ugly works that maybe someone had spent lots of money on framing.