Don't use Silicone. If you ever have to remove/reseal it, it won't. Silicone is the spawn of the devil. Nothing sticks to cured silicone including fresh silicone. If it gets into a porous surface, you will never completely remove it so it will never seal again.
If you're going to use a sealant, get some Lexel.
If you're going to use a sealant, get some Lexel.