I have read bad things about silicone on other forums. Apparently it doesn't like to be over painted or varnished, and once it's on it can never be completely removed.
I'd be more inclined to use Sikaflex or something similar.
From: Paul H (admin) [via UK HBBR Forum] <[hidden email]>
Sent: Sunday, May 16, 2021 10:29:22 AM
To: Port-Na-Storm <[hidden email]>
Subject: Re: New Gunnels
I'll be picking up a Sapele 4x1 plank from Robbins very soon; I'll create two strakes.
I'm leaning towards screwing from inside the hull/cabin, sealing with silicon and coating the Sapele with oil,
What are the views about screwing from inside or epoxying the strakes in position?
What have you done on your boat?
Paul
PS My reason for using screws:
Easy maintenance/repear.
No epoxy to protect from UV.
Foredeck and cabin are already strong.