This is our pick as the best RV roof sealant available on the market. As it is white, it is fantastic for being used in sunny climates and owing to be a tape. The backing contains a UV coating to help the tape last a long time despite constant exposure to UV rays. It’s incredibly easy to apply on RV roofs that need resealing for protection against the elements. It only requires the RV owner to do a small amount of surface preparation for a fiberglass roof to be suitable for the application. Each roll of tape is 50 feet in length and 2, 4, 0r 6 inches wide. This means you can cover just over 8 square feet with the skinniest roll and up to 25 square feet with the widest roll.