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Painting MDF and plywood - questions

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ras2a:
I'm using a mixture of PVA (Evostik) and matt white emulsion.  The PVA acts as a sealant and primer (it dries clear) - MDF is very porous and soaks paint up like a sponge!  I'll then probably give it a couple of coats of grey primer (maybe sanding between coats) and finally a couple of coats of satin black.  Lucky really as I have access to a spray booth at work and am gonna borrow my mates compressor and gun.  hoping that spraying my cab will negate the need for much sanding though!

cheers

Craig

greywolf22:
I used a water based primer and paint on my plywood cab.  Worked very well, and yes I did sand between every coat with a very fine sand paper.  

DanteBK:
I'm about to start painting my MDF cabinet and had the same question. I've heard enough people say, "don't, whatever you do, use water-based primer because it'll mess up the MDF," and enough people say, "I used water-based primer on MDF with no problem," so here's my question:

Is the water-based primer messing up MDF thing just a sensible theory or has anyone actually had their cabinet messed up by this?  ???

sirwoogie:
Slightly off-topic question. I can figure it out for myself I guess, but I'd rather see what the community has to say:

If I do countersunk holes on the outside (ala UAII), fill with wood putty and sand down, would putting primer/coats on be sufficient to hide it completely? I've actually never used wood putty, and I never seen it done without leaving some evidence. That more or less sets me in the direction of the construction for the cab.

Sylentwulf:
I had the same concern about countersinking and woodfilling from the outside, so I'm using a ledger system from the inside instead. I HAVE used woodfiller, and theres no way in hell I'm gonna fill 100 tiny screw holes on the finished outside of the cab.

The reason they suggest doing it that way is because they also suggest using laminate, which would completely cover any imperfections anyways.

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