I have a black faced BH412 and I think it would look considerably better if painted silver... has anyone tried this yet? and tricks besides rattlecan silver?
I've painted a few grills - personally I'd say "don't do it", but don't let that stop you.
The problem is unless you're getting it powder coated, or some kind of baked-on enamel deal...it's probably going to chip pretty easily. (If your cabs go through the hauling abuse like mine do)
So, given that fact, you're gonna have a pretty beat up, ugly grill in under a year.