I've seen BIN from Zinsser recommended here as a good way to seal the
edges of MDF prior to painting. I've routed a profile (quirk and bead)
on some MDF and want to apply something that will either sand smooth
or, better yet, seal it smooth, before final painting.
Any other recommendations? Thanks.
Lightweight drywall joint compound works really well and is a lot
easier to sand smooth afterwards. Smear it on with a sponge or brush,
not too heavy, let it dry, and then give a light sanding. Prime and
paint and you're good to go.
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