MDF Board


Old 08-29-05, 01:53 PM
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MDF Board

I am scraping and sanding old paint off of trim around my house. I have the porch left and I start scraping and its MDF board. I can't scrap it or sand it
because its breaking off in chunks. what is the best way to prep this wood to be painted without replacing it.
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Old 08-29-05, 03:29 PM
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plain MDF isn't meant for exterior applications. If it's exposed to the elements, I'd replace it. If its reallt MDF, it had better be an exterior grade.

If you're talking about a masonite-type 5/4 trim board or something, and it's flaking off in chunks, I would say sand it with a belt sander, but you must have already tried that without success.
Old 08-29-05, 03:46 PM
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It might be masonite. Whatever the material is, it would probably be best to replace it. You may be able to wire brush the loose, prime with oil base primer, patch with durhams rock hard putty [or ext spackle] and prime again.
Old 08-29-05, 08:22 PM
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thank you for your reply, it could be masonite. I will try your suggestions and if no success will replace it. thanks and will let you know how it turns out.
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