Features March 2019 Issue

Chlorine and Caulk Don’t Mix

While interviewing boat maintenance professionals for background information preferences, several quipped that in reality, they replace far more caulk because itís mildewed than because it has failed or stiffened. They seemed to favor either 3M 4000 UV or Sika 291 for exposed uses, because they leave a smooth finish and resist mildew. When we asked about strength and bonding on-deck, they referred us back to the mildew problem. Thatís what causes most of their call-backs. (Below the waterline, where looks donít matter, they favored 3M 5200 or Sika 291.)

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