hey there, my 92 winnie has the gel coat filon sheet exterior. i found a product at an automotive paint and body supply store. the name on the label is "car beauty pro" the labeling on the quart bottle states: RV, BOAT & AIRCRAFT WAX. -- one step cleaner wax-----use on all painted, gel coat, fiberglass, chrome and aluminum surfaces---removes light scratches, oxidation, fallout, black streaks, marine and jet fuel build up, water spots, bird droppings, and more----carnauba wax and polymer sealers offer a long lasting, high gloss shine. the product is made by, BAF industries, 8010 dixie highway, florence, kentucky. i paid $17.00 for the quart bottle. INTERESTING SIDE NOTE: on one half of the bottle it is printed in english, on the other half, in french. possibly for our northern neighbors??? hope this helps. joe from dover.