What is the diameter of 7 strand caulking wick? Eric Boudreau March 30, 2021 15:19 Updated The diameter of 7 strand caulking wick is roughly 1/16". Related articles Caulking and Marine Sealant Coverage Chart Can TotalBoat Seal be used to bond StarBoard? Sikaflex 1A surface compatibility and application What surfaces and applications are suitable for Sikaflex 221? How to properly seal fuel fittings and fuel Lines Comments 0 comments Please sign in to leave a comment.