Polyether Multi-Caulk Sealant
I used West Marine Polyether Multi-Caulk Sealant on my Beneteau 351 cockpit seats. If the teak pieces are loose, I pried up the teak, cleaned the wood and fiberglass, cleaned old caulk off the edges of each piece and reseated it with the caulk with proper spacing between each. If your teak is still seated well then just gouge our the old caulk. Then use blue tape to carefully cover the teak leaving the space between the pieces and around the edge. Then use your calking gun to run a bead around all the spaces. You can use a rubber gloved finger to smooth and remove excess caulk. Last trick is to CAREFULLY remove the tape after an hour or so BEFORE the caulk dries.