When I was in the biz, we used MDO, filled the edges with spackle then
primed them with alcohol base primer. Then painted the whole panel,
front and back with a foam roller using "Ronan" brand enamel.
http://www.ronanpaints.com/graphic.htm No sealer necessary. You'd be
surprised at the incredible finish you can get with a foam roller once
you get the hang of it.
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