White caulk

[Luke1988]

Is there a caulk which stays white

Not silicone sealant

I want to put some in the gap where the bannister meets the wall

see pic

 

[Wayners]

Either fit a new top but chase out wall so it's sunk in a tad or cut a new top a tighter fit.

As for caulk it can be painted.

As for staying white in that situation maybe not forever. I'd use a polymer white mastic. Mask the wood tight to joint and pull soon as you do it..