Looking for a good sealer for masonite/hardboard

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Forum topic by emrhappy posted 05-14-2014 11:39 PM 1030 views 0 times favorited 2 replies Add to Favorites Watch
View emrhappy's profile


62 posts in 1537 days

05-14-2014 11:39 PM

Greetings all…

I just finished an out feed/assembly table… It 4 layers 1/2” OSB then 2 3/4” MDF topped with 3/16” hardboard/masonite. I wrapped it in some maple hardwood to protect the corners. I’d like to seal the top to prevent it from swelling if it gets wet. Even though the top is ‘sacrificial’ and I’ll replace as needed, I’d still like to get some protection on it. Any suggestions? I’ve tried poly, but it’s not working out too well… Very slick and scratches very easy.


-- I cut that thing twice and it's still too short!

2 replies so far

View bigblockyeti's profile


3587 posts in 1144 days

#1 posted 05-15-2014 12:27 PM

Aerosol lacquer should work pretty well, much thinner during the application than poly and should result in a fairly hard surface. Despite being hard to start with, tempered Masonite can still suck up quite a bit of whatever thin finish you use.

View Redoak49's profile


1824 posts in 1412 days

#2 posted 05-16-2014 12:48 AM

I made some counter tops with masonite and finished them with shellac. It took several coats as the first really was sucked into the board. They looked good after about 4 coats of the shellac.

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