Before you but the bases back on, take a countersink to the holes in the gelcoat
. The space gives the sealant
a place to go instead of squeezing out - kind of like putting a small o-ring on the fastener shaft. And make sure you check the deck core
- if there's any doubt, rip out the core
and fill it in with kitty hair (epoxy with fiberglass
strands mixed in). You don't want to lean up against it in weather
and feel too much flex - makes you religious in a hurry...