Bottom line: This tied the Sika 291 as the Best Choice for an adhesive sealant. Loctite PL S40. Reviewed by Practical Sailor in August 2015, Loctites PL sealant series offers an economical alternative to marine products. High in viscosity and relatively slow curing like 3M 5200, the PL S40 is physically comparable to 3M 4200 and Sika 291, but.. Sealants and Caulking Compound Formulations. 3M 5200 Fast Cure is messy to work with but is very tenacious as a marine adhesive and sealant. Polyurethane: Recommended for permanent bonding because of its enormous adhesive strength of about 700psi, polyurethane is more of an adhesive than a sealant. It is good for hull/deck joints and bonding.

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Stick with the Silicone Rubber. Sealant to ensure that your metal is well protected. After all, you want to get. the full life from your boat. Apply the. sealant, and don't be afraid to be generous. It's better to over-seal than under-seal, as you can always go back over the area you've sealed and scrape off excess.. 3M's 5200 is a super-strong polyurethane sealant meant for critical jobs. Image courtesy of 3M. Polyurethane caulks are the super heroes of the marine sealant world and if there's a "Super Man" caulk, it's 3M's 5200. Imagine trying to exert 400 to 700 psi of force on a fitting to get it free from your boat, and you get the idea—it.