Motiv HD Bowling Ball Plug – 2 Gallon KitHas proven successful in reactive resin, urethane, and polyester bowling balls.Excellent adhesion to all cover stock materials.Extremely crack, chip, and impact resistant.Virtually no post-cure shrinkage so you will not have to worry about separation or flat spots.No air bubbles as it allows trapped air to escape before it cures.Drills straight and true without bit chatter or chipping around the rim.Cures in 6-8 hours at recommended temperatures.3:1 ratio of resin compound to hardener.Pumps Sold Separately