I use the blade BUT ONLY after a wash were the water is beaded on the car and I am certain no sand/grit is in the mix. As a matter of course, I never use the blade on a surface where gravity will naturally drain the rinse water.. doors/fenders/rear-front facia as those surfaces are more likely to have some residual grit anyway if that's possible after a wash..
So far, I can't atribute any damage to the finish being the result of the blade.. it makes the dry job so much quicker and with less towels..
HB
