I like the menz glaze when applied by hand.. It was a real bear to remove when I applied with the PC for some reason (possibly user error).. When applied by hand (thin, light pressure, rub in until it starts to dry, buff with MF), it came off much easier, filled better and looked better..
I think it will look fine topped with p21s.. But there are probably better glazes out there if you're topping with a carnuaba.. The reason I really like the menz glaze is that it seems to be compatible with sealants over top of it (no streaking)... I keep hearing the clearkote RMG is an amazing glaze, and will probably try it soon..
danny318... I have not used opti-seal, but I have used numerous sealants over the menz glaze with no problems and no streaking..