RTV or better known simply as silicone caulking. Use it on any holes you make in your siding. There is also a gummy tape that acts as it's own gasket sealing. You can also buy automotive grade double back tape at auto parts stores that is used by factories to attach logos and accessories and forget the screws.
2019 Cherokee Wolf Pup 16BHS flipped axle
2019 Ford F-150 S-Crew 5.5 bed V8 w/tow package, TBC, Tow Mirrors, 3.55, 7000# GVWR, 1990#CC
Husky Centerline TS WDH 400-600# spring bars