The Collaborative International Dictionary of English v.0.48:

caulked \caulked\ adj.
   1. having cracks and crevices stopped up with a filler such
      as caulk. Contrasted with uncaulked. [Narrower terms:
      weather-stripped]

   Syn: calked, chinked, stopped-up.
        [WordNet 1.5]

   2. having the seams between planks packed with waterproof
      material; -- of boats and ships.

   Syn: calked.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

caulked
    adj 1: having cracks and crevices stopped up with a filler [ant:
           uncaulked]