Osgoor,
Just go to Home Depot and buy some Henry's 212 caulk from the roofing section. It is the USA version of the Henry thermoplastic that Winnebago buys from Canada. If Dicor is a silicon it is not recommended for fiberglass roofs. One tube should do you. Two if you were to replace all the caulking.
It is always better to pull out the old caulking but you don't have to pull out any that is obviously doing its job. I use a small bent "hook" (looks like an awl that has been bent 90 degrees) to get under the caulking and pull it up. If it pull right out then you can typically pull out 6 to 8 inches or more. But, if it only tugs back, then leave it and spread a thin layer over the top of it. (If you already have a bunch of layers over the top, then pull them out.) Or, in other words, pull it out were you see the cracks but go back in four or five months to see if you have other cracks. Just take your time. It is not a hard project; just takes some patience and time.
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Dennis & Trish (and Sparky Doodle)
2013 Meridian 42E
2011 Ford Explorer
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