Re: Remo Ambassador coating wearing off...
My situation is exactly the opposite- I got 12", 14", and 16" coated Ambassadors for tom reso heads last year. Obviously I haven't hit them a lot but they haven't come off. However I had to get a Evans G1 for my 10" reso and the coating wore off when I tapped it with a drum key. Even now the center and lug spots have little chips taken off of them. I think it sounds much worse as well.
I've had a Coated Ambassador and a Coated Vintage A as interchangeable snare heads for about 2-3 months now and neither show any sign of flaking.