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Sealing MDF [message #67275]

Thu, 28 April 2011 12:14

NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...

Master

I am in the process of constructing three 4 Pi speakers out of 3/4" MDF (with a 1 1/2" front baffle - depth adjusted to account for internal volume decrease).

I am moving soon to a very HOT and HUMID environment (Cambodia) and understand that MDF is moisture sensitive. Therefore, I plan to seal the enclosures inside and out with two or three coats of Zinsser BIN primer/sealer to help with moisture resistance and to harden the enclosure. I will be covering with paper-backed red oak veneer via the hot iron method.

Will the BIN primer/sealer cause any problems with applying the veneer? I will be using Better Bond Heat-Lock Veneer glue.

Thanks,

VIRIBUS MARI VICTORIA

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Re: Sealing MDF [message #67284 is a reply to message #67275]

Thu, 28 April 2011 21:13

Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA

Illuminati (2nd Degree)

If using MDF as described I'd apply veneer inside and out with contact adhesive which is one of the few water-proof glues.

OTOH, given a choice in Cambodia (!), I wouldn't touch MDF and go straight to Marine Plywood made with water-resistant adhesive.

Are we talking the Cambodia formerly ruled by Pol Pot and currently at war with Thailand? We Americans are really zenophobic and this one is having a hard time picturing a high-end sound system there.

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Re: Sealing MDF [message #67285 is a reply to message #67284]

Thu, 28 April 2011 22:06

NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...

Master

Yep, that Cambodia! I will be there for two years. Not sure about my housing - but I am fairly hopeful it will be air conditioned.

Already have the MDF all cut ready to glue (will use Titebond II). I am hoping that by using a shellac-based sealer/primer both inside and out of the cabinet the MDF will be adequately protected from moisture.

I have no experience with veneer and the hot iron method seems to be the easiest. However, I could paint as I would not be going for a piano gloss finish.

VIRIBUS MARI VICTORIA

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