I like Geocel Proflex RV Sealant as well but it's a bear to squeeze out of the tube. I recommend making sure you warm up the tube to help. I use a hair dryer for a couple minutes. It's also quite expensive and hard to keep good so use as much as you can. At $20 a tube for the clear stuff sent Prime, you need to get your money's worth.
2020 Silverado 2500HD LT, CC, 4X4 6.6 Duramax
2021 Grand Design Reflection 311BHS
I asked him to do one thing and he didn't do any of them.