Just an FYI, I found today at Home Depot, in the roofing section, a product from Lanco that is 4" seaming tape suitable for EPDM roofs on RV's. It looks exactly like the eternabond roll I just bought. It is the grey butyl stuff - not the peel & seal or tyvek products. They also offer a "Ultra Siliconizer" also suitable for EPDM Rv Roofs. I remember looking at their products when I was first investigating for available products, and all I found were products for non-rubber or epdm roofs, then today for the first time I saw these products. They either changed the formula or added a new product to the line-up. I researched on line and found a couple people that had used this with success. Some stores may offer different products, but worth looking into...