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

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Forum topic by Vududude posted 367 days ago 506 views 0 times favorited 5 replies Add to Favorites Watch
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Vududude

41 posts in 375 days


367 days ago

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

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Loren

7151 posts in 2231 days


#1 posted 367 days ago

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

View rejo55's profile

rejo55

175 posts in 825 days


#2 posted 367 days ago

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

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NiteWalker

2629 posts in 1160 days


#3 posted 366 days ago

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 375 days


#4 posted 366 days ago

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

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Earlextech

887 posts in 1273 days


#5 posted 366 days ago

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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