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Micheal Harding is the one to query on this. I talked to him about 2 hours (his nickle) regarding materials. He is a very well respected and believe you me, fussy paint maker.
He felt that the MOST stable surface for painting was the MDF board coated with 2 coats of rabbit-skin-glue-no gesso needed. He felt that this was a far superior surface to any of the panels made today and far better than painting on canvas. It is simple and cheap.
Why do you think it would discolor? It hasn't for me. Sometimes the simplest thing CAN be the best. I cannot imagine putting rabbit-skin glue OVER gesso.
As to ABS, I use plexiglas for my pastel box covers. My plastics man has ABS sheets. He told me he would not use them for painting, because they absorb moisture (not good for paint surfaces) warp and are heavy. He has stacks of ABS and can't keep them from warping. Also you have the problem of outgassing with a product like ABS, which means future embrittlement and yellowing. Just ask my husband, he has a doctorate from Brown University in materials and electrical engineering. Also there is a thread here somewhere about the head conservationist at the National Gallery in Washington, who has warned against substrates made of plastic resins.
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