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

  • Advertise with us

« back to Finishing forum

Forum topic by Vududude posted 07-08-2013 06:58 AM 1089 views 0 times favorited 5 replies Add to Favorites Watch
View Vududude's profile


41 posts in 1817 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


10476 posts in 3673 days

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

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

View rejo55's profile


190 posts in 2268 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

-- rejo55, East Texas

View NiteWalker's profile


2737 posts in 2602 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.

View Vududude's profile


41 posts in 1817 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


1162 posts in 2716 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"!

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics