Silicone: Versatile, quick and easy to use, elastic and highly resistant to chemicals, silicone is excellent for isolating dissimilar metals. Do not use polyurethane-based sealants if the bonded items might have to be separated in the future. Polyurethanes have poor resistance to oil and the acids used in products such as teak cleaners. It is good for hull/deck joints and bonding thru-hull fittings but incompatible with ABS and Lexan, and does not adhere well to many other types of plastic. Polyurethane: Recommended for permanent bonding because of its enormous adhesive strength of about 700psi, polyurethane is more of an adhesive than a sealant. Sealants and Caulking Compound FormulationsģM 5200 Fast Cure is messy to work with but is very tenacious as an adhesive. New modified polymer formulas are great options as well but, as always, it is critical to check the product's technical data sheet to ensure compatibility with the surface you're working on. Polyurethane and polysulfide products have been the traditional formulas for many years as they can have longer work time for larger areas and are very strong. A UV stable and easily paintable product would be beneficial in this application.Ĭhemistry: Consider the work time of the product along with the ease of use. Different formulations may not weather as well or may require painting while wet. Anti-Bond 2015 can be a real life saver in the case of hardware that is difficult to remove.Īesthetics and Paintability:Consider whether the application will be visible and will need to look fresh and clean or whether it will be painted in the process. Penetration can be encouraged by first scoring the edge of the bond with a blade, which might be required in the case of winches or other hardware that have been in place for years. The solution is a marine adhesive remover like Anti-Bond 2015, which breaks the bond between the adhesive and the substrate, so deck hardware can be removed. Marine adhesive removers like Anti Bond 2015 debond and aid in the removal of most polyurethane sealants.Ī bond created with 3M 5200 may last forever, so you are in a pickle if you later decide to separate the two surfaces. If you are working with dissimilar surface materials, make sure the sealant works with both of them using the chart below. Applications above the waterline may need adhesive strength for items such as deck hardware, or simply need sealing properties for light duty applications such as electronics installations. Applications below the waterline will require a product that is designed to be submerged. The application and the kind of materials you plan to bond will determine the choice of marine caulking you need. What Materials are you Bonding or Sealing? The data sheet will also detail the proper surface preparation steps and it is critical to only clean and prepare to the manufacturers specification as some cleaners, such as alcohol, can stop the material from curing properly. It is always recommended to read the product's technical data sheet for these times. Weather plays a big role in this curing process, and may accelerate or slow the curing process. Full Curing time can range from a day to a week or more. There is typically a tack or skin time - your working time, dry time – may return to service and full cure time – completely cured. In the case of some adhesive-sealants it can be considered nearly permanent.ĭrying times and curing times can vary. The bonding strength varies from moderate to extremely strong. Because sealants are permanently flexible, they can withstand some movement of the surfaces to which they are bonded without losing adhesion. Marine caulking sealants cure to a durable, flexible, rubbery consistency, adhering to surfaces to prevent water or air from penetrating. Butyl Caulking Tape is a popular alternative to liquid sealants.
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