I will be painting a baffle a satin black color. The speakers are flush mounted and the recesses have been rounded over with a 1/4" bit. The edges have a 45 degree chamber. Any suggestions on how to get a nice, smooth finish on that? All I could think of is lots of sanding, primer and coats of black then more sanding. Is there a certain type of paint or primer that works well with the fibrous texture of MDF?