SLU

[CC Solutions]

CCR is spot-on.

The ridges can be sanded down if you catch them early enough. K15 dries hard though so you have to catch it early. There are pads for grinders made of a material that looks like a Brillo pad, my distributor calls them TAZ pads. They will eat through K15 rather quickly and not clog. You probably know that using diamond grinders doesn't work well on patch material.

The ridges were probably formed because they got on the leveler too late with their smoother. This can also be a factor of a porous substrate sucking the water from the mix.