Seems to me silicon would work just fine. It's water resistant and plyable. When I caulk something, I use masking tape to tape off the area above and below where I want to caulk. I caulk the area, run my finger over the caulk then remove the tape. This process gives you a nice clean line of caulk.
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2016 Ford F150 Platinum
2013 Coachmen Freedom Express 233RBS
Prior: Jayco Pop Up, Shasta Bunkhouse, Rockwood 2560G Pop Up
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