Priming mdf

[jsmithconstruct]

I am currently cutting some architectural screens out of mdf. Does anyone have any recommendations on the best primer/process to use on mdf?

Trying to eliminate the raised "hairs" that is a result of routing into the mdf.

[adrianm]

http://www.talkshopbot.com/forum/showpost.php?p=74323&postcount=6

Always the way I've done since reading that post and it produces great results.

Other ways are to use a 50:50 PVA mix as a sealer or use drywall compound. Neither is as good as Dannys' technique in my experience though.

[GeneMpls]

http://www.talkshopbot.com/forum/showpost.php?p=74323&postcount=6

Always the way I've done since reading that post and it produces great results.

Other ways are to use a 50:50 PVA mix as a sealer or use drywall compound. Neither is as good as Dannys' technique in my experience though.

Polyvinyl alcohol (PVOH, PVA, or PVAl) is a water-soluble synthetic polymer (not to be confused with polyvinyl acetate, a popular wood glue)? Gene

[adrianm]

http://www.screwfix.com/c/sealants-adhesives/pva-primers/cat850040

[GeneMpls]

So... it is a glue or sealer- both on that page. Thanks Gene

[adrianm]

Works as both depending on how you want to use it. Terminology might be different in the US to the UK but over here PVA-White Glue-Wood Glue-School Glue are all interchangeable terms for the same thing as far as the average punter is concerned.

[jerry_stanek]

Try some plum creek mdf it machines a lot smooter

[myxpykalix]

The first time i used mdf and tried to paint it, it was like trying to paint a sponge. No matter how much i sprayed on it just soaked it up.
I read here to use a 50/50 mix of titebond glue and water so i mixed that up and liberally painted that on the routed mdf and let it set up to dry.

Then i sanded it down because it does give the effect of a rough surface so you need to sand it smooth but it basically forms a hardshell finish that you can paint over and turns out great.

[Ajcoholic]

I do some MDF work - I use a high solids primer, made to go under the post-cat laquer I use as well. It is super thick, and a few coats sprayed onto the the cut edges or face of the MDF seal it completely.

I would assume most finishing companies supply a similar product for use as a primer...

Using thinned wood glue can help - but there are easier ways to do it IMO.. with the products made for this particular job.

No matter what, you will have to do some sanding/buffing after the first coat.