I'm trying to achieve a smooth painted finish on MDF.
I have a project where I'm cutting rings out of 3/4" sheets (each ring has a 17" external, 15" internal diameter). The rings are then glued together to create a tube.
My previous experience of finishing MDF was priming (with a brush) a set of loudspeakers, sanding down and then spraying them with tins of paint.
I had huge problems with the primer (International MDF Primer) as it never seemed to dry properly - attempting to sand it would result in dragging off tiny rolls of primer and it clogged the paper. I even bought a second batch, thinking the the first was contaminated, and left the piece to dry for a week. It still wouldn't sand.
As I don't have a HVLP spray setup, could anyone recommended a primer that I can paint/roll onto the outside of these rings, that will sand well, so I can produce a perfectly smooth finish that I can spray paint? I'm in the UK BTW.