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Priming MDF surfaces ( not cut edges )

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Priming MDF surfaces ( not cut edges ) blah@blah.com 05-13-2007
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Posted by blah@blah.com on May 13, 2007, 10:50 pm
Hello-
I built soffits in my basement using MDF. All the cut edges of the
MDF are either inside unexposed joints or are covered up by pre-primed
moulding.

Can I prime the smooth outer surfaces of the MDF with just regular old
PVA primer before I paint or is there something special that should be
used with MDF?

My plan is to prime with PVA and then applya white latex paint. I
plan on using an airless sprayer.

Thanks for any feedback...

Kevin


Plumbing 468x60
Posted by blah@blah.com on May 13, 2007, 11:23 pm
After a little more research, I'm thinking about using an oil based
primer ( probably the 'odorless' Killz ) along with a Latex paint.
Any thoughts would be appreciated!

Kevin


Posted by cyberbob on May 14, 2007, 8:17 pm
> After a little more research, I'm thinking about using an oil based
> primer ( probably the 'odorless' Killz ) along with a Latex paint.
> Any thoughts would be appreciated!
>
> Kevin

Since nobody replied I guess I'll answer your question. Definitely do
not use a latex primer. The water based product may "soften" the
surface of the mdf and cause it to swell slightly. Not enough to cause
real damage, but enough to make it a little rough. An oil primer,
"cheap" will work, will seal the surface quickly and give you a good
bite for your favorite topcoat.

Ed


Posted by Steve on May 15, 2007, 11:23 pm
alt.home.repair:

> Since nobody replied I guess I'll answer your question. Definitely do
> not use a latex primer. The water based product may "soften" the
> surface of the mdf and cause it to swell slightly. Not enough to cause
> real damage, but enough to make it a little rough. An oil primer,
> "cheap" will work, will seal the surface quickly and give you a good
> bite for your favorite topcoat.

I've been building custom shelves for a couple of years from MDF, and I
always use latex Kilz. I've never had a problem. I put on one coat of
Kilz, which dries in a couple of hours. I then sand it smooth and put on
two finish coats of latex paint. Depending on the paint, I can get a
mirror finish.

There's nothing wrong with using the oil-based primers, but strong smells
are triggers for my wife's migraines, so I avoid them.

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