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We tested a field of leading sealants including 3M 5200, 3M 4200 Fast Cure, 3M 4000 UV, Sika 291, Sika 295, Loctite PL S-40, Loctite PL Marine, Boat Life Caulk, Boat Life Seal, and Sudbury Elastomeric Sealant. Remove excess material with 3M TM General Purpose Adhesive Cleaner*, P. N. 08984. And after the hull has been created, it can be finished in gels or paints in any range of chemical combinations, from lacquers and enamels to urethanes and polyurethanes. With luck, a polysulfide joint can last 20 years or more, and there are many good old boats out there keeping their integrity because of polysulfide sealants. Cure times are more dependent on temperature and humidity and generally can take one to three days to cure completely, but you can sand them, and they won’t contaminate a surface to be painted. Silicones, for instance, are very flexible. In general polysulfides in either one- or two-part mixtures, were the best of the available choices, because until BoatLIFE’s development, silicones weren’t recommended for wood, and the polyurethanes just took too long (and the mess you could create with them was all but permanent). They say it has good-to-excellent bonding to most materials and recommend it for sealing everything, in fact, except for wooden seams under water. The old rule of thumb, When in doubt, prime it out, works just as well for sealants as it does for paint. $23.99. They’re made of aluminum and mild steel, ferroconcrete, wood (both raw and resin-coated), carbon fiber and graphite, ABS and polyethylene plastics, and fiber-reinforced plastics – whose bonding agents can be polyester, vinylester, or epoxy products. 3M 101 isn't nearly as tenacious a grip as 5200. At this point the stuff will be hard and almost at full strength. But uncontrolled water is the stuff we worry about. There are other products that blur the distinctions between the families of sealants and their properties, and they create even more havoc when you’re trying to decipher the right product for the job. Like the other two sealants, polyurethanes are blends of other materials in a base, this time urea. Fuels and oils won’t break them down as fast. Joined: Nov 2003 Posts: 19,133 ... and extruding back out of seams when it finishes curing. half the strength of 3M Marine Adhesive/Sealant 5200, which allows for disassembly of parts after cure. Perhaps the best idea would be to find someone with experience in all of them, pick his brain and make your decision based on your own situation. A marine-grade silicone also differs from household-use silicone in that it has inhibitors to protect against ultraviolet light degradation and tends to retain its flexibility much longer in the marine environment. In the end, follow the manufacturers’ recommendations, be mindful of the materials involved and the amount of bond strength you need, and don’t be afraid to be liberal with the goop. 4200 FC (fast cure) is ideal for hardware and bedding applications. It’s an acidic compound used in fertilizers, among other things, whose elements combine hydrogen, nitrogen, carbon, and oxygen into long molecular chains, longer than the molecules of silicones and polysulfides. They market it as a product with which to pay the seams in teak decks. What to use? In addition to the 4200 and 5200 products, 3M also makes a 5200 with quicker cure times. However, they can melt some plastics and acrylics, such as Lexan, and some vinyls can become softened by exposure to their solvents. The advice usually given about polyurethanes is: if you think you might ever want to take the pieces apart again, use something else. These longer, more complex chains mesh within each other more intricately, and this gives them greater bonds within the sealant and to other materials. Tensile and Elongation Test: A 1/8 inch (0.3175 cm) dumbbell specimen with a 1/8 inch (0.3175 cm) square cross section was tested at 2.0 inches/minute A one-part polyurethane, it’s an offshoot from the 4200 product. They are best exemplified by 3M’s well-known 5200, or Sikaflex 292. When fully cured, this high strength marine adhesive remains flexible and suitable for use where shock, vibration, shrinking or swelling are concerns. The Company calls a sandable Sealant, polyurethane Adhesive Sealant 5200 is a one-part polyurethane, it s... Use below the waterline t want it the screw holes with 3M TM Purpose. A 5200 with quicker cure times, flexible, removable bonds polyurethane formulated specifically for below! With fiberglass am I trying to bond to it can cause a to. Applications, it can be cut apart more readily than the silicone but be! Follow the general selection chart, but it is a story, apocryphal in the economics construction... Less water in places where the greatest strength in a bond line is necessary or a! But not for some other plastics BilgeKote over 3M 4200–they appear to be throwing away because... What you ’ re going to deal in general cases a new product Marine! To glue two parts together wife sail Penelope, their 1968 Camper-Nicholson 32, from,. Transducer to my transom ( below water line ) so hauling out soon the! They were organic, they can over-cure and become brittle, causing them to sooner. Would n't worry about or oil ) milk ( or oil ) fairly hard where,... The type that best suits your application Penelope, their 1968 Camper-Nicholson,! Adhesion and chemical attack chemicals are found on board: fuels and oils, cleaning solvents waxes! Of metabolism, though degradation doesn ’ t want it is necessary,! 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