The sticky spots are most typically uncured resin or hardener which hasn't been completely mixed in. If it's excess resin it can be removed with a strong solvent like lacquer thinner. If it's excess hardener it can be removed with soap and water. The voids can be filled with small quantities of newly-mixed Mirrorcoat, carefully using a spatula or squeegee to smooth out any excess material. Let this cure 24-hours and lightly sand the surface with medium-coarse sandpaper. Finally, apply an additional flood coat at 4 fluid ounces per square foot.