Many silicone products are acid based and that will hurt aluminum. I repaired my strakes (outside) with Steel-Flex, but G-Flex would have been just as good.
G-Flex is flexible and somewhere I posted where they show it being 'weeped in' by warming the area with a hair dryer immediately after applying, which thins the viscosity and allows it to flow into areas. Too much heat will speed the cure.
Found it, https://www.tinboats.net/forum/viewtopic.php?f=3&t=40954&hilit=g+flex
I think if it were mine, I'd fix from the inside and if I saw any evidence it weeped through, then I'd do some on the outside too. You'll be able to see it better on a clean hull or put cardboard on he ground or under the suspect area(s) - look for spots falling.