I HAVE A WALK IN SHOWER THAT I NEED TO REPAIR.
ONLY THE GROUT ON THE FLOOR, ALONG THE FOUR WALLS,
AND ONLY IN PLACES, HAD DAMAGE. DO I HAVE TO TAKE OUT ALL OF THE GROUT? WILL I BE ABLE TO BLEND IT IN, OR CAN I GO LIGHTLY OVER THE PLACES THAT WEREN'T SO BAD ?????