Ben Strawn works using acrylic on plexiglass because it scratches off so easily. He likes encaustic but really wants more clarity, plexi is great because he can sand it and really get that milky blur but still keep areas he wants clear. It's smooth so he can scrape stuff off with steelwool and then paint back into that smooth surface again. He hates canvas- he always works small so that texture really shows up.
Check out his full bodies of work
HEREAnd check out his studio site
HERE