AVS Forum Special Member
Join Date: Mar 2001
Location: Madison, AL, USA
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It's been my experience (so far), that there's a difference between filling and sealing.
I've been able to to completely smooth a joint with either glue&water or spackle along with a lot of sanding. After prime and paint, the joint is invisible. However, I've got boxes that started out with invisible joints but after a couple of months, they pronounce themselves loud and clear. The only thing I can guess is that the smooth surface of MDF doesn't soak in primer/paint while the adjoining MDF piece with the cut edge *does* soak that stuff in in such that it expands a little bit and broadcasts the joint between the two pieces.
So while making the joint smooth can be done any number of ways (along with some elbow grease), I'm looking for the best way to actually seal the cut edge of the MDF so that the joint *stays* invisible. So far, my best results have been with glue&water.
PS. I might add that I'm using paint and primer, not Duratex. The primer/paint is pretty unforgiving whereas I'd imagine that Duratex could hide an unsealed MDF edge.