Surfboard Ding Repair Kit By PhixDoctor. The SunPowered Polyester Repair Kit; because it\'s not if, but when! A complete repair kit stocked full of quality items to get you back in the water fast! What does this kit have and can I use it on my epoxy board? Phix Doctor\'s SunPowered Polyester Kit is stocked with more premium brand Silmar resin and many other helpful items you won’t find in the competitions kits. Q-Cell, Gloves, dual Grit Sand Pad, 7x13inch fiberglass and many extras are standard items here. This product is not for use on EPS/Styrofoam cores commonly used in Epoxy boards.