Would also recommend TDS-SIS 440. The re-caulking I did with it lasted until the end (of the deck) and it's less fuss and same cost as Sika with primer.
I replaced one of the short planks in the cockpit that had a crack with a reclaimed one from the deck. Used a wood chisel to remove the old plank and clean up the space (this is destructive, but the plank was already broken), then laid the new, thinner plank on a bed of adhesive caulking and weighed it down with a bin bag full of water (adapts to the shape). When cured (3 days to ensure a deep cure), pour away the water, then sand the slightly proud new plank down to match the surroundings. After a summer it has gone grey to match the rest and you can't really see it, other than perhaps it looks slightly newer and smoother than the rest
If you want to keep the plank intact, you can also try to mask off the surroundings and squeeze as much caulking underneath the lifting plank, then weigh it down and clean up, but the result will probably be not as good.