I recently purchased white panel board, with is basically painted mdf board. It is wonderful to paint on after the surface is slightly sanded and gesso is appliced. I was told that it isn't wise to paint on mdf board it lacks archival or it simply won't stand the test of time. I did some research on my own only to find that there are so many artist who Paints on mdf, professional artist, such as Roger Bansemer, Peter Brown, a large number of British artist that I follow. So this can be a bit confusing. The truth be told, in my case, I don't believe that I need to concern myself with that issue. But it was interesting to hear this from an artist who has worked in a museum and has seen fine pieces of art crumble.