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454Casull 11th April 2005 05:35 PM

Drywall compound as MDF filler?
Can I use drywall compound to fill in the cut edges and corners of MDF before priming?



mwmkravchenko 11th April 2005 05:46 PM

It's too soft!
THere are great auto body putties that work well with MDF but I would not use drywall compound even if it was all that I had. It is much to soft. Will eventually break off and you will be sorry that you did it. Get a good ployester scratch filler. One that has to be used with a hardener. Canadian Tire has the stuff. Don't use the red stuff that comes from a tube. It just doesn't work that well except for very thin filling. Basically only for scratches and little dings.


Cabinetmaker at large.

chris ma 11th April 2005 05:55 PM

I do not think that is a good idea with dry wall compound, they are not strong enough.

I have use liquid nail apply to the edges using a 1 inch spreader/scraper to good effect. Just scrape off extra before it is set and they can be sand well and get smooth too. In fact I have used it to the MDF main surface using a 4 inch spreader to scrape on the surfaces, as MDF absorb it well just a very very thin layer of liquid nail left on it to really seal the MDF before painting. Work fast like plastering the drywalls.

The Butcher:D

planet10 11th April 2005 06:20 PM

I'll secound the auto-body filler suggestion... drywall compound is a bad idea.


dhenryp 11th April 2005 06:22 PM

Dry wall compound is not good to fill in cracks or, even worse, to build up a corner or edge if you'ce cut it wrong. I have had good results using dry wall compund to fill in the pourous cut edges of MDF. It won't help to seal the ends as the dry wall compund will let the MDF below it suck the paint right through it. What I have done is first seal the edge with a 50/50 mixture of carpenter's glue and water. Let dry then put a little bit of thin joint compound (kind watery is OK) on the edge with you finger. Sand it down with fine sand paper - after sandiong you should see MDF with just a light haze of compound in the pores. After this apply primer and paint.

jleaman 11th April 2005 06:23 PM


Originally posted by planet10
I'll secound the auto-body filler suggestion... drywall compound is a bad idea.


Me being the one that dry-walled and lots of mudding at daves. Then to add to that 4 years of it in Prince Rupert where i used to live Drywall filler / Mud is not good for wood it will crack and fall out of the places you put it into. It dryes out and turns brittle.

454Casull 11th April 2005 07:02 PM

Is Bondo an automotive body filler?

EDIT: Looks like it is. Should I get the lightweight or heavyweight type?

mwmkravchenko 11th April 2005 07:26 PM

Bondo is not a surfacing putty!
Bondo can be used for really big goofups or making cool curved work. But it definitely is difficult to sand. The stuff that I am telling you about is made to be sanded. It feathers out to a nice edge. The scratch and filler putty that IS HARDENED WITH A CATALYST is more than durable enough.


Liquid nails is a soft glue. I think acrylic or latex based. Not something that I would put paint or heaven forbid laquer. The glue ides works in a pinch but is much harder to make nice and smooth.


454Casull 11th April 2005 07:48 PM

Can you remember the name of it? :( Do all two-part putties work well?

What should I use to prime the surface? I was thinking I would get something made specifically for MDF, but I don't know how it would work on the filler.

thylantyr 11th April 2005 08:47 PM

There are many ways to seal mdf edges.

A. Diluted yellow wood glue with water, 50/50 mix.

B. Generic Bondo body filler works.
[Comes with cream hardener.]

C. Minwax sanding sealer.

D. BIN primer

If you want to seal the MDF but not the edge, then I would
use the Bin primer or the sanding sealer, but not Bondo
or diluted wood glue.

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