I try and avoid brushed on paint being at the joints for most of my custom figures
If the base of your figure is going to be black...with just some details added...I can't recomend Krylon Semi Flat enough...
Overkill was painted with Krylon...then details were added...only the Silver on his head got a coat of sealer to knock down a bit of tackyness that was there.
Or on Voltar here...Only the Chest was sprayed with Krylon Semi Flat Black...then craft acrylics were used to paint on the gold details...I think the finish is really pretty good...it's as close as I've been able to get to factory finish and still have some durability.