I need to know from step one how to repair a approximately 5inch by 3inch gash(about1/8 to 1/4 inch deep) on the side of my fiberglass boat just above the water line.What do I buy,where to get it from?The boat is eggshell offwhite colored with gel coat.This repair will be very visible so I want do it right the first time.Ive done minor bodywork to cars before so Im familiar with sanding,bondo etc.never any fiberglass repairs though.<br />HELP!<br />p.s. there is a west marine store near me.