The only thing I’d use is 3M Cavity Wax so I already know I sound biased. Lol
After revisiting areas that were previously treated with the stuff, I really never have a need to search for something better. You can get tips that are nearly 3’ long and spray 360° in a cavity.
3M Cavity Wax Plus, 08852, 18 oz (511 g)
https://www.amazon.com/dp/B0741FHDPF...JDVXM72WRVFBK0