i've had sg on my car and its been 3 yrs +....its money well spent....beading still visible (altho not as acute as in the 1st year) and the glow is still visible after each wash.....i washed the car on my own the 1st year but due to work commitments and time constraints....the car has been given the roadside or petrol station wash treatment ever since.......many a times i've had the car wash guys asking if i want a wax job after the wash...i will decline politely each time and after the wash they will comment saying that the car must have been recently waxed and i'll just smile

btw...my ride is white in colour