Sealing MDF
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141008
Printed Date: October 30, 2025 at 8:48 PM
Topic: Sealing MDF
Posted By: pts760
Subject: Sealing MDF
Date Posted: March 12, 2016 at 10:01 PM
I'm building a enclosure with mdf and fleece to be fiberglassed. I plan on prepping everything in order to finish with paint. I know that mdf sucks moisture in like a sponge so I was wondering how people are sealing mdf to make it paintable so I don't have to go through a trial & error process.
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I drink current, eat ohms, and bleed voltage
Replies:
Posted By: tonanzith
Date Posted: March 13, 2016 at 3:47 PM
primer primer primer. or you could always glass over the mdf but i have always done heavy primer and a light sanding before painting. unless its for a boat then i always glass on top of using marine grade mdf.
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Gary Sather
Posted By: digdug18
Date Posted: April 04, 2016 at 12:19 PM
Or use marine grade plywood instead. Though it depends on the circumstance(for yourself or a customer, what you're building, pressure involved, space, etc.)
Posted By: pts760
Date Posted: April 04, 2016 at 9:41 PM
*Update* I picked up some oil based rustoleum primer, applied it, and it took paint like a charm. Would never have thought to use a oil based primer prior to this project but it makes perfect sense now. I kind of feel like a idiot for not putting 2 & 2 together before.
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I drink current, eat ohms, and bleed voltage
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