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seal/prime MDF edges even if they won't be seen?

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Forum topic by Vududude posted 07-08-2013 06:58 AM 590 views 0 times favorited 5 replies Add to Favorites Watch
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Vududude

41 posts in 478 days


07-08-2013 06:58 AM

Topic tags/keywords: mdf finishing

making a book shelf with some MDF shelving with wood trim/banding for edge support. I’ve been reading up on the dangers/worries about MDF:

should I seal/prime the MDF edges even if they won’t be visible because of the trim/edge banding? should I do this to prevent any MDF dust or formaldehyde form escaping?


5 replies so far

View Loren's profile

Loren

7725 posts in 2334 days


#1 posted 07-08-2013 07:22 AM

I wouldn’t. It won’t stop off-gassing anyway.

-- http://lawoodworking.com

View rejo55's profile

rejo55

175 posts in 928 days


#2 posted 07-08-2013 09:04 AM

Depends on humidity. Here on the Gulf Coast, MDF is just like a sponge and soaks up water like you wouldn’t believe. I have seen half-inch MDF become one-inch in a very short while.
You don’t say where you live, but you might consider sealing the edges if you live anywhere besides Death Valley.
Just saying.
Have a good’un
Joe

-- rejo55, East Texas

View NiteWalker's profile

NiteWalker

2710 posts in 1263 days


#3 posted 07-08-2013 05:44 PM

I would seal it with primer anyway. Zinsser BIN and no need for spackle, glue sizing, etc.

-- He who dies with the most tools... dies with the emptiest wallet.

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Vududude

41 posts in 478 days


#4 posted 07-08-2013 06:36 PM

ah, the other question I hadn’t thought of was that I was planning on gluing the joints as well, would priming before hand make the joint much weaker? I’ve typically used Gorilla wood glue

View Earlextech's profile

Earlextech

994 posts in 1377 days


#5 posted 07-08-2013 07:56 PM

If you are gluing the solid wood edge to the mdf edge I would consider that sealed.

-- Sam Hamory - The project is never finished until its "finished"!

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