Portlights can have tempered glass in them, or Lexan, or Plexiglas, and frames of ABS or metal with rubber or vinyl inserts for linings. CURES FAST One-part adhesive sealant requires no mixing, typically cures in as little as 24 hours so you can get back on the water faster. When fully cured, this high strength marine adhesive remains flexible and suitable for use where shock, vibration, shrinking or swelling are concerns. Deck seam sealants are obviously a large market, because 3M has also developed a new product called Marine Teak and Wood Seam Sealant. 3M 4200 Fast Cure is a one-part general purpose polyurethane sealant with good adhesion to wood, fiberglass, gelcoat, plastic, and metal. Are you doing deck seams or mounting a through-hull fitting. 100% of reviewers recommend this product. 3M 4200 Fast Cure Forms watertight, weather-resistant seals on joints and boat hardware above or below the waterline. 3M™ Marine Adhesive Sealant Fast Cure 4200: ... 4200 Fast Cure Tack-Free Time @ 73°F and 50% RH 1-2 Hours Rate of Cure @ 73°F and 50% RH 3/16" (4 mm) per 24 hour Shore A Hardness (ASTM C661) 40 Tensile Strength (ASTM D412) 180 psi (1.24 MPa) It bonds to fiberglass, wood, steel, and aluminum, above or below the waterline, and after curing can be drilled and tapped, sawn, planed, filed, screwed, or nailed without fracturing. How We Tested Like 5200, it can be cleaned up with mineral spirits, though petroleum products won’t affect it once it’s fully cured. Stays flexible too - allows for structural movement. 4200 FC (fast cure) is ideal for hardware and bedding applications. 3M Marine Adhesive Sealant Fast Cure 4200, 3-oz (6) 4.8 out of 5 stars. Its flexibility allows for the dissipation of stress caused by shock, vibration, swelling or shrinking. The slow cure stuff takes 4 or 5 days to fully cure. Thanks. 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. Any time a hole is drilled, even partially, through a solid structure, it provides a place for water to enter. It's chemical resistance is quite good, so I wouldn't worry about a little spilled milk (or oil). They are also a lot easier to handle in tight corners than caulking guns. check out the. One-part polysulfides, the silicones, and 3M’s product all cost roughly the same, and the two-part polysulfide is the most expensive of the lot. After the hull had been lifted into the air and settled on the truck, someone noticed that the keelbolts had not been fastened and that the only thing holding the lead ballast keel to the hull was the 5200 applied as sealant.) Historical records show that early boatbuilders were confronted by the same problem. He and his wife sail Penelope, their 1968 Camper-Nicholson 32, from Falmouth, Maine. For example, 3M has created a new product known as 4200, which has nearly the same strength characteristics as 5200 but lacks the same internal shear strength, so two joined parts can be separated without the usual amount of cutting, wedging, and swearing. $23.99. At this point the stuff will be hard and almost at full strength. Today, there are three basic families of chemicals used in marine sealants: silicones, polysulfides, and polyurethanes. Hardware materials are just as diverse: aluminum, zinc, bronze, and stainless steels are some of the metals, and there are alloy choices in each of those. The biggest complaint about any sealing job is, “I put two ounces of stuff there, so how come it still leaks?” Invariably, when the autopsy is performed and the part is removed, the sealant that is there is microscopically thin and has failed because there wasn’t enough of it to fill the space. It’s what rots our balsa-cored decks, drips on our bunks on a rainy night, or causes the boat to sink when we’re not paying attention. It is created from combining silica, one of the most useful of the industrial chemicals we have and one of the most common building blocks of Planet Earth, with a variety of other organic compounds. That hole is probably at least partially filled, either by a screw or a piece of hardware. Common in household and automotive applications, it is among the first things we think of when we use the term “sealants.”. I remove 5200 with a hot knife. BoatLIFE also makes what the company calls a sandable sealant. They said they preferred to test and recommend on a case-by-case basis. However, they can melt some plastics and acrylics, such as Lexan, and some vinyls can become softened by exposure to their solvents. The main selling point is that, unlike polysulfides, it fully cures in 24 hours and is tack-free and sandable within 30 minutes, a real consideration on a project that is literally underfoot. 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. In addition to the 4200 and 5200 products, 3M also makes a 5200 with quicker cure times. Called Fast-Cure 5200, it has most of the strength of regular 5200, but the cure time is significantly reduced: to tack-free in 1 hour and fully cured in 24 hours – a real plus for manufacturers and others working on small areas with lots of bedding. Silicones, for instance, are very flexible. Cure: Relative Humidity Temperature Time Cure Depth Open Time 50% 70°F (21°C) 30 hours N/A Open Time 90% 90°F (32°C) 4 hours N/A 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. The down side is that, though they are elastic, most silicones don’t have much bond strength, particularly to fiberglass, and won’t do much more than hold themselves together. The polysulfides, such as BoatLIFE’s Life Calk or 3M’s 101, bond to wood better than silicone does and also bond fairly well to metals and fiberglass. It forms watertight, weather-resistant seals above and below the waterline. LIVE Jet Ski RADIO - every Wednesday at 7:00pm eastern standard time. You use it as it comes out of the two-part tubes, without the need to mix anything else into the matrix. Polysulfides are not as elastic as silicones and shouldn’t be used where constant vibration will occur while the part is under stress or expected to flex too much. Remove excess material with 3M TM General Purpose Adhesive Cleaner*, P. N. 08984. Other industries, in particular the aerospace industry, were developing materials to seal panels that made up flight surfaces and withstand the rigors of flight and space travel. It looks and handles like silicone and comes in clear as well as the white and black of the silicone family, but it has greater bond strength even when applied to wood and fiberglass. Keep the goop where it belongs, under the part or in the tube. These longer, more complex chains mesh within each other more intricately, and this gives them greater bonds within the sealant and to other materials. You are somewhat limited by choice, as not all are available in both colors; but all are advertised as having similar imperviousness to chemicals and similar lifespans. When it’s applied to overhead or vertical surfaces, it will not sag or run. 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. More of it means less water in places where you don’t want it. 4. Palmetto Watercraft Association of South Carolina, Region 6 Renegades - Michigan PWCToday Chapter, http://cgi.ebay.com/ebaymotors/ws/eB...m=270299621828, http://multimedia.3m.com/mws/mediawe...Vs6EVs6E666666, http://www.3m.com/product/informatio...e-Sealant.html, Middle Tennessee Personal Watercraft Club, If this is your first visit, be sure to However, it seems to be a breakthrough in materials technology, one which I think is going to spur a whole development of similar products and one which will really expand our bag of boat repair tricks. I leave for a kayaking camping trip in three days. 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