I would spend time and look at every sq inch of the existing roof sealant looking for any cracks so you can reseal them. You can clean the area that needs to be resealed with a tooth brush and rubbing alcohol before your repairs for better adhesion.
Also look over any of the rubber roof looking for nicks scratches or holes or anything else you think could benefit from a touch of sealant.
Its really hard to store a partial tube of dicor so plan on using the whole tube. In fact buy 2 so you have one on hand in case of an emergency.
also check off the side of the roof where the rubber meets the edge trim and look for cracks around the rain gutter extensions.
also recommended is to put a bead across the top and sides of the marker lights to stop water from getting into them.
for sealing anything that is not rubber, I recommend Geocell proflex RV (amazon)
As you drive down the road start looking at all the RV's you see. Look at the sides and back of fiberglass RV's, You will see many with these bumps sticking out on the side? the will be along the top edges, below any thing on sides that is cut into fiberglass like lights, speakers, etc, you will see them on the back below the marker lights, on front below marker lights?
this is delamanation, caused by water getting under the fiberglass. you don't want that to happen so spend time often looking over everything.
This is an extreme case of delamanation, but you get the idea.
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