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3K views 17 replies 17 participants last post by  ssnvet 
#1 · (Edited by Moderator)
What is the best way to seal MDF, especially the edges to completely eliminate moisture? Shellac, polyurethane, epoxy???
 
#12 · (Edited by Moderator)
Epoxy, nothing else comes close. It is used in fabrication of wooden water tanks, bathtubs etc. There are kinds that impregnate the substrate and form water tight seal. Ask shipwright on this site or look up his blogs/posts. He is an expert on this and I recall he recommended a particular brand used in marine applications.

Found it: http://lumberjocks.com/topics/22534
see post #18
 
#17 · (Edited by Moderator)
"I THINK ITS CALLED MDO". I'm familar with MDO, I've used it before, but it is very hard to come by in my area. Ifound a sign shop who will sell me a 4×8 sheet of it for $95 + tax.
"Use a water proof mdf (exteira) is the trade name .nice stuff". I've also heard of exteria, but that is even more hard to find and I understand it is quite expensive. I can find all kinds of materials I can use from the internet, but no one locally can provide it. It seems that only industry is privy to good materials. Unless I can commit to 1000 sheet orders, I'm SOL
 
#18 · (Edited by Moderator)
The MDO I've used before is a good quality plywood (7 veneer layers for 3/4" panels) with a paper thin layer of phenolic on both faces. It comes and stays dead flat.

We ran some jobs at work out of it a long time ago and have had a short stack in our oddball plywood pile ever since. Unfortunately, that pile hasn't been stacked properly and the panels are now slightly warped.

If I recall, it cost us in the mid sixties per sheet, but then again, we purchase trailer load quantities of CDX plywood, so when we need something special or odd, we get good pricing.
 
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