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I get 8x4 sheets of MDF. Break them down to 1x1s and prime both sides with whatever waterbased primer I have on hand (usually BM Fresh Start). Once dry, I'll hit the one side with a quartz based plaster primer and then its off to the races. The plaster primer has a fair amount of grit to it so if I am making a sample with a finer material (like a grassello), I'll sand the primer down first.