Features March 2019 Issue

Caulks Versus Mildew

Sika 291, 3M 4000 UV hold strong after three-plus years of exposure.

We expect a lot from sealants. They must withstand UV, salt and cleaning chemicals, bond to everything, flex to absorb mechanical and thermal strains, be strong but removable when equipment needs serviced, and stay white. Wow. In PS “Marine Sealant Adhesion Tests “(December 2016) we tested the shear strength of many caulks on many materials and delivered a few tentative recommendations. Three years later, it is time to follow-up with field observations.

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