If anyone is interested in polishing their SR20 or 22 let me recommend a product called " Astro Shield" I polished ours the other day after having it 60 days and I must tell you it’s as good if not better than we we picked it up at the factory in April. Goes on easy and is 200 times more durable than regular wax. No problems with the contents in regard to the composite material in the aircraft. Noticed about a 5Kt increase in airspeed also. Maybe it’s an optical illusion but I think it’s faster and I’m sticking to that. Fly Safe.