I use 5200 on marine applications. It is tough stuff. The regular version takes 7 days to set up and is considered a permanent product. I don't know if I would use it on a roof or not because once set up, it is extremely difficult to remove.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof