Bondo, Glazing Putty, or MH Ready Patch for MDF Seams - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 05-30-2019, 05:46 PM - Thread Starter
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Bondo, Glazing Putty, or MH Ready Patch for MDF Seams

My box edges have been sealed with 50/50 glue and water, but even with sanding some minor fill is needed. Bondo is pretty thick, and is not spread thin that easily. Does glazing putty work? What about MH Ready Patch?
I think primer has to be applied prior for MH Ready Patch.
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post #2 of 9 Old 05-30-2019, 07:40 PM
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I think there are plenty of products that probably work well but I've tended to just use wood glue mixtures. Thin with water to seal, thicken with sawdust to fill.

The collection bag on a hand random orbital sander is a handy place to store fine sawdust until needed.
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post #3 of 9 Old 05-30-2019, 08:09 PM
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Traditional wood filler putty has worked well for me.
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post #4 of 9 Old 05-31-2019, 12:54 AM
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The pink wood filler putty and drywall spackle, both turn white when dry. I’ve used both now and haven’t had a single seam show even despite a couple rough edges I’ve overcome. In some cases I’ve done both. Wood filler first, sanded, then drywall spackle to ensure a perfectly smooth seam.


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post #5 of 9 Old 05-31-2019, 03:29 AM
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I use spackle. Sands easy, applies easy.

I've also used bondo and glazing putty. Both work, but they don't sand as easy and the mdf comes off way quicker than the filler in those cases.
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post #6 of 9 Old 05-31-2019, 05:18 AM
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Spackle and bondo


Spackle is the easiest and you can add water later if your can dries up.


Bondo is the best IMO and it does spread thin super easy with a straight edge.

Last edited by Trimlock; 05-31-2019 at 05:23 AM.
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post #7 of 9 Old 05-31-2019, 05:53 AM
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What are you finishing with? The Duratex folks are local to me and they say that some fillers don’t bond well with Duratex. They recommend Elmer’s color change filler and I’ve been using that with Duratex with great results.

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post #8 of 9 Old 05-31-2019, 06:26 AM
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I used regular drywall patch on my VBSS and haven't had any problems.

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post #9 of 9 Old 05-31-2019, 06:58 AM
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It's been my experience (so far), that there's a difference between filling and sealing.

I've been able to to completely smooth a joint with either glue&water or spackle along with a lot of sanding. After prime and paint, the joint is invisible. However, I've got boxes that started out with invisible joints but after a couple of months, they pronounce themselves loud and clear. The only thing I can guess is that the smooth surface of MDF doesn't soak in primer/paint while the adjoining MDF piece with the cut edge *does* soak that stuff in in such that it expands a little bit and broadcasts the joint between the two pieces.

So while making the joint smooth can be done any number of ways (along with some elbow grease), I'm looking for the best way to actually seal the cut edge of the MDF so that the joint *stays* invisible. So far, my best results have been with glue&water.

PS. I might add that I'm using paint and primer, not Duratex. The primer/paint is pretty unforgiving whereas I'd imagine that Duratex could hide an unsealed MDF edge.
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