I don't believe that Silicone is the right answer. It can't be painted for one thing. You can search on the words "rv caulking," and come up with a lot of ways. Also, if I remember correctly (I lost my bookmarks) silicone caulk will not stick to all surfaces so you want a caulk that is multipurpose, flexible to a variety of substrates, resists weathering and yellowing, dries fast. Also, if I remember correctly, you should use a urethane based caulk. You may also want to consider a self leveling caulk.
When in doubt, ask the manufacturer what they uese and try the same brand.
Edited: Check Dyco C-10 Sealant.
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