Au contrair (sp) Paul....i think I get a much more even application with a pc, and waste is really non negligable considering the benefit of pad anyway. Granted, the pad and product arent polishing, there just sealing, but thats what there designed for. And with sealants like BF, even approach is everything.
I would never consider using a bonnet for applicatoon or even removal. I feel there real attraction is post removal. Just as the PC elevates the polishing possibilities, so does the bonett/PC for final buffing.....Of course, this is my opinion.....=)