the biggest key to keeping a leak proof roof is keeping it maintained reguardless off what type of roof it is.If the seams crack open it.s gonna leak whether it's rubber,metal,fiberglass or whatever.my trailer has a rubber roof and twice a year I apply a uv protectant which also helps in keeping the roof from getting as dirty and stained which helps to keep the rest of the camper looking good.
05 sunline 267sr
01 F-250 V-10 4x4 Lariat supercab SB auto 4:30 LS
draw-tite 1200# trunnion wd,friction sway control,prodigy
happy camping Rich,Maryellen,Josh and Jake