You can use just about anything, start with a sanding sealer than a clear polyurethane.
I am in the process of building my first cnc machine using mdf and am new at this all round. I am wondering what is a good sealer for mdf.
What kind of topcoat will you be using?
Mach3 2010 Screenset
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Shellac... Yeah, definitely shellac.
It'll seal things up without causing it to swell since it's alcohol based. As opposed to a water or oil based sealer. And Shellac dries in just a few minues and will accept "ANY" kind of paint very well.
Yeah, like he said! Yes, I know I am repeating anoel...'cause he is right.
Shellac primer is the answer. It dries in minutes so the MDF does not act like a paint sponge. It seals out moisture unlike other primers, and it takes the final coat very nicely. BIN is a brand available around here; sold as a knot and smoke sealer...careful though, not all knot sealers are shellac.
Latex final coat is fine, Something semi or gloss for the final will be easier to keep clean.... leftover exterior house paint will work well too.
Last edited by sol; 10-02-2004 at 10:41 AM.
Thanks guys, I'll try that!