Answer: calks

AnswerCrossword Clue
CALKSDoes some sealing (var.)
CALKSMakes tight against leakage.
CALKSStops up crevices.
CALKSStops up (cracks).
CALKSUses oakum.
CALKSHorseshoe cleats
CALKSHorseshoe parts
CALKSGrippers on horseshoes
CALKSRepairs, in a way: Var.
CALKSPlugs air leaks
calksCALK, to make the seams of a ship watertight, also CAULK
calkscaulk