3M 5200 Adhesive Sealant 3oz.
[40-5203]

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The preferred choice for sealing masts. Goes on smoothly, won't sag, and remains workable for up to 4 hours. The seal is extremely strong and retains its strength above and below the waterline. Provides incredible adhesion, yet stays flexible after it's cured. Becomes tack-free in 48 hours; completely cures in 5 to 7 days with no shrinkage. Clean up with kerosene or mineral spirits. 3 oz. tube. White.