No sir, it`s not hard on the surface, does look it but it isnt....
margallar, you can use anything, microfibre,sponge,washing mit.....if you get any sand or dirt caught in it while washing your ride, it will scratch........so try gettin the dirt,sand mud off the car with only water pressure and without rubbing it, then use car wash shampoo on your applicator be it a washing mit or a sponge or whatever you are using...