I wouldn't use silicone under any circumstance unless it was one
of the Dow Corning professional caulks - 795 works well if you use
the proper primers and cleaners for most substrates. Silicone is
junk caulk other than these.
If you would like to caulk it one time that will last the rest of
your lifetime, use a good polyurethane caulk like Sonneborn's NP-1
or Tremco's Vulkem 116. Both products are paintable if that is
part of the consideration.
These statements assume you know how to install caulk properly.
Caulk should only bond to 2 clean and dry surfaces. Backer rod or
bond breaker tape should be used in the bottom of the joint to
prevent 3 point contact. Few people can gun an acceptable joint,
so masking tape before application is prudent. Caulk striking
tools are easier on the fingers than wiping joints by finger tip.
Keep the whole world singing . . . .
Click to see the full signature.