I posted this first in the wrong area so posting it here:
I'm getting ready to cover my entire fiberglass roof with Dicor Fiberglass RV Roof Coating. But before I do, I'm in the process of prepping the roof. One of the things I'm planning on doing is to scrap out the old bonding caulk along all the roof seams, which includes the front and rear cap on the top and as it curves down and around to the sides to where it goes under the gutter seam molding. Then do the same thing all along the entire edge of that gutter seam on both sides. I'm also doing this same process vertically down both entire sides to the bottom of both front & rear cap. I'm going to use NuFlex 460 sealant as my chalking/bonding agent per Winnebago callout sheet.
Now, in addition to that process on the roof, after I do this dig out old sealant & replace with NuFlex 460 to the top area on the front & rear cap, I was going to lay across those top seams 4" External Bond Tape and then as the last step apply the Dicor Fiberglass RV Roof Coating to the entire roof. Here's a link to the video which explains this process.