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Discussion Starter #1
Hello - first post ever on here :thumbup:. I'm installing 6 panel hollow core doors in our home as part of our current remodel. We bought slab doors, and I had to plane the doors down on two sides to get the same dimensions as the old doors.

When I planed down the one side, the band running between the two door faces is made of MDF. I've heard that you can't prime MDF with latex because it will cause it to swell. My question is, will a latex primer cause the MDF to swell to the point that it damages my doors and disrupts the hinge mortises? If so what would you reccomend to seal the MDF? I've read to use BIN, wood glue, joint compound, all kinds of crazy things...

Thoughts?

http://www.homedepot.com/Doors-Wind...splay?langId=-1&storeId=10051&catalogId=10053
 

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I would have no hesitation to prime MDF with water based primer. It is true that it swells a lot, but it has to be exposed to a great deal of liquid before that happens.
 

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priming mdf with a latex primer will almost always give you a very "fuzzy" finish. It's really never a good idea to prime MDF with latex if you want a smooth finish. I would do like the first reply suggested, and just hit that side with a quick spray of oil based primer - Kilz, cover stain, etc... You'll get a much smoother finish on your final coat.
 

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Discussion Starter #5
Do they sell an oil based primer like that in a rattle can? I can't remember ever seeing it.

I do have about half a gallon of SW shellac primer left yet still. I was hopeing to avoid using it but maybe it will be the best bet. I have had problems using it (runs, sags, ect). Stuff seems to paint like water, and I don't have the skills to be using it yet. I'd just hate to have it drip or run onto the door face and then I don't know if I could ever get the textured surface to look right again.....
 

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Discussion Starter #7
hmm so being that the doors already have a factory sealer on them, do you think I could just shoot the exposed MDF with the rattle can, and then prime over everything with a latex primer? that would me alot easier then going the shellac route..
 

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Discussion Starter #9
A gallon of Zinsser cover stain and SW cashmere later, and the doors are looking mighty pretty! thanks for the help!
 
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