Term: Gelcoat Image: [{"name":"images\/public\/dictionary\/Gelcoat_c6z367hm.jpg","usrName":"Gelcoat.jpg","size":143012,"type":"image\/jpeg","thumbnail":"images\/public\/dictionary\/thGelcoat_0q3vchv1.jpg","thumbnail_type":"image\/jpeg","thumbnail_size":143012,"searchStr":"Gelcoat.jpg,!:sStrEnd"}] Definition: A combination of resin and pigment that comprises the smooth outside coating of a fiberglass boat.