I recently need to replace some rotted wood railing posts on a painted deck/porch. I tried to fit the new posts and bottom rails as tightly as possible - but there are gaps.
Before I paint the new wood - I want to fill the gaps (between the posts and bottom rail) so that water/mositure does not reach the unpaint wood (i.e., space between the new posts and bottom rail).
Should I use caulk or wood putty? Any recommendations on which type of caulk or wood putty?