Reply by BLarge

I just finished SMS cabinets for my shop. I used MDF as the panel inside all of my doors…. I primed it, sanded it flat with high grit paper, did a few coats of good white paint with flotrol and thinned at 75/25, then brushed on some poly thinned to 75/25…..

It cam out very flat and smooth…. I lightly sanded between poly coats, but only to get out dust and freakin cat hairs hat no matter how I tried could not keep then all out!

Itf you can’t spray I would try that…. Be sure to prime well and seal MDF end grain….