There are few applications that any type or grade of silicon is suitable for. 3M 4200 is a sealant, adhesive, and can be easily removed if you ever need to reseal. Also, when removed, silicon leaves a residue that nothing will adhere to including more silicon. All in all, it's some really awful stuff.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner