Not sure on the color? Order a FREE sample here RV Fiberglass Filon in Tan siding is a great option for upgrading the exterior of your RV, camper or trailer. Unlike aluminum siding, fiberglass does not dent since it is made of a durable filon material. Fiberglass siding is built to last for a long period of time while keeping it's same great structure. This fiberglass filon siding has a beautiful tan or 'champagne' shade to it so you won't need to paint it!