|Forum topic by The Lumberjock formerly known as renners||posted 354 days ago||1387 views||1 time favorited||10 replies|
354 days ago
Let me preface this by saying I have painted acres and acres of mdf.
I used to use waterborne primer, but invariably found the waterborne formulas would raise those flecky bits more than I would like. So with a waterborne primer the workflow would go something like this:
Tack cloth —> spray a light primer coat —> spray light primer coat 2 —> light sand/tack cloth —> spray wet primer coat —> sand flat/tack cloth, notice raised flecks now exposed by sanding , —> spray another light primer coat —> sand/tack/start spraying top coat.
I got sick of this and switched to Zinsser B·I·N as a sealer and primer. This virtually eliminates the problems of raising the flecks in a sheet of mdf, two coats of B·I·N and a careful sand leave a perfectly smooth primed surface, BUT, if anything, it seems to take way longer for the top coat to dry over the B·I·N. – adding hours to the drying time.
What other ways of preparing mdf are there that won’t lead to extended drying times for a topcoat?
I’d consider using cellulose primer apart from I don’t know if there would be compatibility issues with a w/b top coat, and really, I see spraying cellulose primer as a step backwards.
I also know that not all mdf is created equal. I always buy a brand called Caberwood Premier which has a better surface than sheets costing a few € less. Spray equipment is Fuji HVLP.
Any insight you can give me to speed up painting process would be much appreciated.