Clean the surface of the countertop well, since dust and dirt may prohibit the finish from adhering. Mix together one part of degreasing liquid dish detergent and two parts of clean water. Apply this cleanser to the counter with a soft rag and rub it over the entire area.
Wipe down the countertops well, using a dampened rag until no more cleanser remains. Allow all of the cleaned surfaces to dry completely, which might take 1 or 2 days. Prepare the area by covering the floors and immovable items with tarps and edging the walls with painter's tape where they meet the counter.
Open the black primer from the kit and empty it into a plastic paint pan. Roll the paint roller into the primer until the roll is well covered. Cover the countertop surface with the primer in long, straight lines.
Dip a sponge brush into the primer and apply it to the countertop trim and edges. Try to keep the primer even all over. Allow the primer to dry at least 6 hours.
Shake the mineral flakes from the kit onto a natural sponge. Pat the sponge over the whole countertop to distribute the minerals. Make the application as random in appearance as possible, just like real granite.
Wait 2 hours for the mineral flakes to set. Run your hands over the countertop and feel for any roughened areas or areas that are too built-up. Sand these areas very lightly with 320-grit sandpaper, if necessary.
Roll the clear topcoat from the kit over the countertop surfaces using a clean paint roller. Apply the topcoat in straight lines, as you did the primer. Allow the countertop to dry for 8 hours and examine it again for any rough or raised areas; re-sand as needed.
Apply a second, thin layer of topcoat over the entire countertop. Do not allow the topcoat to pool or drip and ruin the finish. Let the countertop dry 48 hours before you use it.