Filling countersink holes in MDF - AVS Forum
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post #1 of 12 Old 03-15-2012, 08:33 AM - Thread Starter
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So I have a lot of countersink holes with screws on the outside of my MDF sub. How can these be filled-in and still eventually achieve a shiny look at the end of staining and polyurethane?
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post #2 of 12 Old 03-15-2012, 08:52 AM
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I think Bondo auto-filler is the best bet. I've used it several times and it's often recommended on the forum. It's available at Home Depot near the Caulking section. Drawback is that it STINKS and i think the fumes are dangerous My wife goes crazy when i use it because the garage is uninhabitable for a day or two.

Wood putty might be ok too, but i'm not sure how well it bonds to the primarily metal (screwhead) surface inside the divot. I've used it before but i can't remember how happy i was with it.

Last year i tried using drywall spackle after reading about it somewhere.... my goal was the same as yours, to get a nice smooth painted finish. DONT DO IT. It's far too fragile and after painting over it, i bumped a speaker when carrying it through a doorway and it dented the spackle under the paint and made a big ugly mess.

Good luck,
Joe
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post #3 of 12 Old 03-15-2012, 09:59 AM
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Bondo is an awesome filler for MDF, after it's sanded, you can't feel the patch. I don't know about it's ability to take stain, I normally use paint or bedliner material.

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post #4 of 12 Old 03-15-2012, 10:36 AM
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Oops. My bad. I thought you were painting. For staining I don't know what you can use. Maybe wood glue and Mdf dust mixture? Don't know how that would stain either tho
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post #5 of 12 Old 03-15-2012, 11:18 AM
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The usual solution is to use a plug tool/bit to make plugs from scrap MDF that you glue in the holes. You have to use just a drop because glue on the outside won't stain well. You can also buy plugs from various woodworker suppliers.

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post #6 of 12 Old 03-15-2012, 12:30 PM
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Dont use drywall compound hahaha my cabinets look like the have bad acne
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post #7 of 12 Old 03-15-2012, 02:17 PM
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Yeah if you're staining plugs are the only sure bet...

My only question is how are you staining mdf? People stain that stuff?

I used wood putty on mine and it said it was ok to stain, but even if it was you would still see a difference. I painted so it worked out great.
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post #8 of 12 Old 03-15-2012, 03:12 PM - Thread Starter
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Thanks guys.
Been reading a lot about staining. I was thinking of oil-based stain, then spray painting the edges black. Someone sent a link for one that looks awesome.

I'm not opposed to just painting it. How do you do that?

What type of paint? Sealer first, last, or not at all? Primer? Or just spray paint?
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post #9 of 12 Old 03-15-2012, 04:15 PM
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I have used steel filled 5 minute epoxy before

Quote:
Originally Posted by Subjga View Post

Thanks guys.
Been reading a lot about staining. I was thinking of oil-based stain, then spray painting the edges black. Someone sent a link for one that looks awesome.

I'm not opposed to just painting it. How do you do that?

What type of paint? Sealer first, last, or not at all? Primer? Or just spray paint?

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post #10 of 12 Old 03-15-2012, 06:53 PM
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Quote:
Originally Posted by Subjga View Post

Thanks guys.
Been reading a lot about staining. I was thinking of oil-based stain, then spray painting the edges black. Someone sent a link for one that looks awesome.

I'm not opposed to just painting it. How do you do that?

What type of paint? Sealer first, last, or not at all? Primer? Or just spray paint?

I just got a quart of krylon satin black acrylic latex enamel from walmart and a foam roller and went to town on mine and it actually turned out pretty well. I filled everything I could and sanded for about 4 hours on the box first and rolled it right on. I think I put about 4 coats on it.

It's nothing special but it fits right in with my speakers.
LL
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post #11 of 12 Old 03-15-2012, 10:05 PM - Thread Starter
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Man, that's a sweet looking sub!

I read somewhere it's better not to sand the smooth part of the MDF. Did you sand the whole thing, or did you mean sand between layers?

Quote:
Originally Posted by ovrrdrive View Post

I just got a quart of krylon satin black acrylic latex enamel from walmart and a foam roller and went to town on mine and it actually turned out pretty well. I filled everything I could and sanded for about 4 hours on the box first and rolled it right on. I think I put about 4 coats on it.

It's nothing special but it fits right in with my speakers.

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post #12 of 12 Old 03-16-2012, 02:18 AM
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Oh mine was plywood. I sanded all of it. I was just showing you the paint.

In theory it would look the same no matter what was under it.
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