First thing I did to my roof was "re"dicor every seem on the roof. I also put a dab of dicor on every one of those roof rail screws. I know they're not supposed to, but they can and will weep over time. Also added geocel proflex (way superior to silicone) around top and sides of all windows, lights and anything else that didn't satisfy me. Factory says not necessary on windows, but agreed it was good cheap insurance. No such thing as sealing too good.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.