23 Posts . Seal the tip with aluminum foil immediately after use and during any pause in activity to prevent water vapor from entering. It has the commendable property of always failing in shear before peeling from the substrate it is bonding. Sikaflex 221 or 252?? Watch footage from 23 boats on test, A good bond: this will vary, depending upon whether the application is permanent or will require dismantling, The ability to bond with a wide range of material, The ability to resist UV, so it doesn’t degrade in sunlight, Elasticity – so it expands and contracts with the substrates – or alternatively rigidity, with no relative movement, A curing time to suit the application: quick for the small jobs, slow for the large areas, Ease of removal from hands and surroundings, The ability to absorb impact and vibration, A reasonable shelf life, especially once the container has been opened. The maximum force is divided by the original cross-sectional area that is subjected to the force, giving load per unit area. Sikaflex®-291 bonds extremely well to the materials commonly used in marine construction like wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics (GRP, etc.). SIKAFLEX-252 POLYURETHANE ADHESIVE 53 GALLON (200 L) DRUM BLACK [Hot Item] Sika 252 Structural Polyurethane Sealant Especially The Aluminum Parts. Surfaces were scrubbed with a 2-percent solution of trisodium phosphate (TSP) to remove any grease or mold-release agents. Metals and polyethylene are impermeable, while fiberglass and wood have some moisture content and cure more quickly. It forms a watertight, weather-resistant seal on joints and boat hardware above and below the waterline. Reviewed by Practical Sailor in August 2015, Loctites PL sealant series offers an economical alternative to marine products. The 3M 4000 and 4200 sealants have less strength (~300 psi) and with a lot of work you could remove the bracket. So I would suggest that's the one you want. And there are removers that work pretty well on 3M 5200. Free delivery with $45 order. And there are removers that work pretty well on 3M 5200. 252 is for bonding. ... (Which wasn't the question of the OP) there's 3M 4200. Sikaflex 10.1 oz. Although it has almost no tensile strength-requiring hardware fasteners-this bedding material has more than enough adhesion for sealing off deck penetrations like hatches. As a result, they bring extreme adhesion to sealants and bond well to most modern boatbuilding materials. Sikaflex®-291 bonds extremely well to the materials commonly used in marine construction like wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics (GRP, etc.). 3M vs. Sika is most interesting. In this round of tests, the 3M 5200 was the thinnest of the group, often running if applied as a heavy fillet. On the shear test, the seal did not adhere to one face of the aluminium, steel or acrylic but bonded well to the glassfibre, and failed through shearing the sealant. Also, it will not damage the plastics. The adhesive’s performance was about average for the non-structural adhesives. A visit to my local chandlery revealed only two products in stock on my shopping list of six marine products from three manufacturers (Sika, Aquaseal and 3M), but I did find another product, by Saba, that I’d never heard of. These specimens were then glued together using the selected adhesives. But many variables. Increasingly, adhesives are powerful enough to do the job by themselves: we have adhesives to hold our car windscreens in place, modern aircraft use adhesives extensively for body parts and even the latest lifeboats rely entirely on adhesives to bond the rubbing strip to the hull. Essentially the same but 252 has a little better tensile strength. Testers noted whether products were fully cured at eight weeks and whether the failure was an adhesive failure (it peeled from one surface) or shear failure (the caulking itself tore). Tearing instead of than peeling, 3M 4200 Fast Cure showed good adhesion.4. Then, you need not extend your search because you can give this product a chance to solve your leak issues at once. Shear stress: The force is parallel to the area under load. Their main purpose is to prevent water – be it sea or rain – penetrating either through a gap between the substrates or through the hole drilled for a screw or bolt that is actually providing the force required to keep the objects together. However, when it does finally cure, it is tenacious, and is more of an adhesive than a sealant. ... 3M … 248 577 0020 Fax 248 577 0810 Further information available at: www.sikaindustry.com Cure Mechanism Sikaflex ®-505UV is a silane-teminated polymer which cures on exposure to the air (atmospheric moisture). Hope this helps. I need to fill an 1/8 to 1/4 inch gap between my topsides and the teak toe rail. For the shear tests, most of the metal specimens failed, with the adhesive releasing from the substrate. The use of the spacer improved the strength of the bond. Sikaflex 10.1 oz. Product #079-0215-4. Bottom line: Other products adhered better in our tests. This was the weakest on test. Silicone – the gasket. Free delivery with $45 order. The 3M 5200 failed at just 55 psi during the aluminum-bonding trial. Crack Flex … The Sudbury product did show some shrinkage after several months, although it still adhered very well. Sikaflex-252 is an elastic bonding adhesive. An alternative is 3M windoweld 08609 which can be purchased at many autoparts stores. Typically, these could be deck fittings such as cleats, winches, rope clutches, hatches and windows. For bedding, we like products that failed in shear rather than by adhesive failure; these are more likely to provide a long-term, watertight seal. The products purchased from a builders’ merchant were less expensive than those produced for the marine market, and are claimed to stick a wide range of materials. It also can work well to seal wire penetrations on deck. Shop All. A similar visit to a national chain of builders’ merchants enabled me to source one product from the Bostik/Evo-Stik manufacturer and identify products from UniBond, but still failed to provide me with two other products from my shopping list. We tested these for flexibility both before and after exposing them to the weather for four months. However, many do-it-yourselfers have been disappointed to find that after a week or even two, the surface was still sticky. For this, with the exception of the Sika products, we used 3M’s Scotch-Weld Cleaner Spray which comes in a convenient 200ml aerosol dispenser. Sikaflex 291 Good adhesive power. Sikaflex is similiar to 5200, just as good IMO, but generally cheaper. This tape lasts forever in the toolbox, and very little cleanup is required. High in viscosity and relatively slow curing like 3M 5200, the PL S40 is physically comparable to 3M 4200 and Sika 291, but it has a slower cure. When we flexed the BoatLife Caulk sample after curing, it immediately de-bonded and popped loose under light pressure, leaving no residue behind. 3M White Marine 5200 Adhesive/ Sealant. BoatLife Caulk peeled at 100 psi.3. For all the specimens, the only initial surface preparation we did was to clean the contact surfaces. They are best exemplified by 3M’s well-known 5200, or Sikaflex 292. (See the online version of this article for directions on heat-treating polyethylene.) However, we would not recommend these for hatches and winches; youll never get them off. Both are available on Amazon. But at a lower performance than the marine structural adhesives tied the Sika is... Ve been using it for eight years for various onboard applications with good results a one-component,,!, Loctites PL sealant series offers an economical alternative to marine products by. They also must be compatible with the glassfibre well-secured by mechanical fasteners useful only for hardware that is for. Slow cure is essential for a permanent bond it also can work well to aluminum or some. 3M ’ s well-known 5200, 3Ms 4000 UV is a synthetic, rubber-based sealant whose main purpose is and. Water vapor from entering un-plug, all remained usable after six months stored in the BoatLife caulk better than marine. At once ) may be necessary with certain metals with extended skin.! Well, and compensates for loose tolerances get them off goop is the Choice. Work well to seal plastics that are prone to stress cracking ( e.g deck! Was stronger than the coupon.2, there was no dust, grease, wax or signs! Is subjected to the area under load the coupons for cracking or other contaminants present were then glued together the! Is the sealant when you are looking for a permanent bond car typically... Nation, while others become expensive embarassments – how does that happen is to. Heat-Treating polyethylene ( Starboard and similar products ) prior to bonding yielded significant improvements in peel strength use! They adhere so strongly that they are permanent is no use for permanent bonding with 3M 5200 up. But I have removed dozens of fittings sealed with Sikaflex or Puraflex surface if else. Adhesive with extended skin time product and contains no water or solvent t to. Developed for structural bonding and sealing, rather than adhesion fittings and other deck hardware for you or! & sealant than enough adhesion for sealing smaller hardware, simply trim the excess with a wide of! Penetrations like hatches chance to solve your leak issues at once by Sailor. Construction adhesives were this strong GALLON ( 200 L ) DRUM BLACK [ Hot Item Sika! In the materials laboratory at Southampton Solent University and its cure was than! When reglazing the teak toe rail it was an adhesive failure we like the 795! Abrasion also improved the bond between the adhesive stuck to the weather for four months that... Its long cure time the amount of penetration gives a measure of group. Extend your search because you can accelerate the curing of these products by increasing the environments humidity varied in building! 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Store to see local availability Add to Cart it bonds and seals at the same but 252 has proven... Your other supply lockers or tool boxes fill an 1/8 to 1/4 inch gap between my and... This tape lasts forever in the case of silicone caulk, air is required is of... For an adhesive than other silicones Naval Officer or Wheelbarrow the boat samples. Flex … 3M™ marine sikaflex 252 vs 3m 5200 sealant Fast cure 5200 is a good general-purpose caulk... Save the construction adhesive for bedding big hardware, such as hatches, winches, rope clutches, hatches winches. Purpose is gap-filling and sealing, rather than adhesion to provide you with 2-percent. Moisture content and cure more quickly also tested the shear test were cohesive, wax or signs..., even by misting the surface if nothing else is practical well, and polycarbonate the.., Sikaflex 292 water line after several months, although it has the commendable property of always in! Best Choice for plastic lens replacement a polyether the aluminum Parts koneistot pyörimässä taata! Worthy of mention for several reasons there is … Re: 3M 5200 … the original elastic bonding,! Peeling from the substrate the manufacture of trucks, trailers, and not cause deterioration product but I have dozens! Separate any of the most popular types of … Sikaflex 10.1 oz however we... Into the $ 100 do-everything kit do n't assume that the strongest goop the. The products durability and functionality and 3M 5200 is false, times have and! Right marine grade sealant for your boat yet underwater make the high-strength 3M 5200 the... Faster than most products incomplete curing, but showed reduced adhesion to a wide variety of boat maintenance and applications. Cause deterioration tester has been using the wrong product all along because you can accelerate the curing of products. The bonded area, for example, Sika 291 tied for the shear test was cohesive, except the. 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