Make sure you get the clear, Stan, not the white.
https://www.acehardware.com/departments/paint-and-supplies/caulk-and-sealants/caulk/1912302?x429=true&gclid=CjwKCAjwmK6IBhBqEiwAocMc8skyg9ULhXCZig9TL7wgk7faOBpx7EdhzBJ-JcLljSuFrKEIosXoAxoCdi8QAvD_BwE&gclsrc=aw.dsIt’s aso available in a larger caulking gun version at Lowe’s and others, but for your proposed job and small RV or house projects the squeeze tube is best. It can also be used on wet surfaces such as in emergency rain leak situations, but like most other products it works best on a cleaned surface.
My gripes are 1) that if not used for many months the product in the nozzle firms up and an inch or two has to be squeezed out with effort before “fresh”, fluid, useable Lexel appears. To mitigate that aggravation, use an extra aftermarket cap seal device of some sort (I use the little red caulking tube “condoms” over the cap and down the nozzle neck), and after each use try tapping the tube base on a firm surface to move product out of the nozzle, but fold the bottom as needed to minimize drying air in the tube; 2) although it takes hours or more to “cure”, once exposed to air it sets up fairly fast, so you can’t dilly dally before using a wet finger to form a nice clean bead around fixtures after initial application.
The bead provides a broader adhesion platform, presses sealant well into the seam (or crack), and of course presents a neat, professional looking finish, with or without overpaint. Keep water handy for that, and also a rag to wipe sealant off your finger; I’ve tried marketed beading devices, to keep the sticky stuff off my hands, but it’s awfully hard to beat the efficiency of a digit.
Joel