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Boat Forum / Building / October 2007Best Bedding for Fixed Port Light Rebuild
I'm rebuilding the Port Light on a Tartan 30. It consists of two aluminium bezels and a plexiglass "window". The two bezels are held together by barrel nuts and bolts, and overlap the coach sides and the plexiglass. I believe I need to seal the outer bezel to both the plexiglass and the outside of the cabin top with some sealant. It looks like the job was done with silicone by the factory, 30 years ago. I've seen some claims that there are good and bad forms of silicone for this. Other claims that something like Boatlife is a better choice. Obviously, I want to use something that can be undone if it leaks again - no 5200! Suggestions? -- > Obviously, I want to use something that can be undone if it leaks > again - no 5200! > > Suggestions? SikaFlex 295U Lew On Oct 2, 6:16 pm, Marc Auslander <marcsli...@optonline.NOSPAM.net> wrote: > I'm rebuilding the Port Light on a Tartan 30. It consists of two > aluminium bezels and a plexiglass "window". The two bezels are held [quoted text clipped - 14 lines] > Suggestions? > -- Dow 795. Oh No! Never Silicone. Silicone is terrible. SikaFlex 295UV is the right stuff. My Opinion. > Dow 795. . > Oh No! > Never Silicone. Silicone is terrible. >> SikaFlex 295UV is the right stuff. My Opinion. > > > Dow 795. What does SikaFlex295 have to do with silicone? Lew Nothing Lew, that;s why it's good. Silicone bad. I hate silicone and won't use it on a boat. Period! >What does SikaFlex295 have to do with silicone? > >Lew > Oh No! > Never Silicone. Silicone is terrible. > SikaFlex 295UV is the right stuff. My Opinion. Hey there...... Dow COrning 795 aint your grandpa's silicone seal........... think "structural" silicone. Really heavy duty industrial hold twin tower windows in w/o fastners really thick kinda silicone. get their spec sheet and check the lap strength for diffrent materials and strech numbers. I used it when I fabricated my 7"x15"x 3/8" polycarb dead lights. Min DC 795 thickness :1/8". Of course fastned with ten 316L 1/4"x20 PH MS. :) Bob > Dow COrning 795 aint your grandpa's silicone seal........... think > "structural" silicone. Really heavy duty industrial hold twin tower [quoted text clipped - 4 lines] > polycarb dead lights. Min DC 795 thickness :1/8". Of course fastned > with ten 316L 1/4"x20 PH MS. At the risk of (1) being exposed as a boatbuilding dunce or (2) even worse, starting a thread as hotly contested as the hypotheteical 40' vertical saltwater still, the comment about Dow Corning 795 leads me to ask a (naive) question. Could this high-strength, high-grab, somewhat flexible adhesive, or one somewhat similar, be used to build a boat from aluminum panels, somewhat the way epoxy is used for stitch-and-glue with plywood? I realize there would have to be a lot of modifications to the construction process. But is the concept reasonable with today's adhesives? Certainly DC 795 seems to have no trouble bonding to aluminum. (Dow says 795 is not for use on surfaces continuously under water, so that would be a problem for anything except trailered boats or dinghy-type uses. But again, I'm just raising the question, not proposing it as a real option. And there may be other adhesives that would be OK for underwater applications.) Alex > At the risk of (1) being exposed as a boatbuilding dunce or (2) even > worse, starting a thread as hotly contested as the hypotheteical 40' [quoted text clipped - 14 lines] > option. And there may be other adhesives that would be OK for underwater > applications.) You might want to contact SikaFlex tech service (Metro Detroit) and ask some of these questions. Lew >> At the risk of (1) being exposed as a boatbuilding dunce or (2) even >> worse, starting a thread as hotly contested as the hypotheteical 40' [quoted text clipped - 19 lines] > >Lew Years ago I read an article about a British engineering student who built a race car as his "Theses". He wanted the body to fail progressively and ended up gluing the aluminum body panels together using an adhesive made by locktite. You might have a look at their literature. Bruce in Bangkok (brucepaigeATgmailDOTcom) >>>At the risk of (1) being exposed as a boatbuilding dunce or (2) even >>>worse, starting a thread as hotly contested as the hypotheteical 40' [quoted text clipped - 28 lines] > Bruce in Bangkok > (brucepaigeATgmailDOTcom) Loctite (now owned by another company)U-05FL 2 part urethane.. Great bond to aluminum (with proper prep). There is another guy I know of using methacrylate for the same concept. You have to use rivets to hold the large panels in place until it cures and to provide shear strength. At the rate I am building mine, I'll be done in another year or so and let you know how it works then. So far, it works well. The only issue is the pot time, but that can be overcome with a bit of planning and some help from friends.  Signature“TANSTAAFL” ____________________________________________________________________________ But - there is a point where criticism, even offered in the guise of love, moves past the point of correction and to the point of destruction. It's a subtle line, but it exists. >Could this high-strength, high-grab, somewhat flexible adhesive, or one >somewhat similar, be used to build a boat from aluminum panels, somewhat the >way epoxy is used for stitch-and-glue with plywood? >Alex There was a light airplane built with glued wing panels - they were aluminum as I recall which is still flying in some numbers. So it can be done Brian W >> Dow COrning 795 aint your grandpa's silicone seal........... think >> "structural" silicone. Really heavy duty industrial hold twin tower [quoted text clipped - 25 lines] > >Alex That is how I built my airplane floats. Stiched together with blind rivets and seams sealed with sikaflex 1A construction adhesive. On Oct 12, 6:03 pm, "Alex" <tuchasoffentisch@_NO_SPAM_gmail.com> wrote: > "Bob" <freya...@yahoo.com> wrote in message > At the risk of (1) being exposed as a boatbuilding dunce or (2) even worse, > starting a thread as hotly contested as the hypotheteical 40' vertical [quoted text clipped - 5 lines] > way epoxy is used for stitch-and-glue with plywood? > Alex Good idea..... Years ago I worked at a research oyster hatchery. They used silicone seal to bond 200 gallon glass tanks. The tanks were set into a 2"x4" wood frame. But the glass panes were all bonded with clear silicone seal...... never a failure I would think 5200 might work for a quick boat. I used it to patch all the lose rivits and holes in an 18' Grumman canoe that a bunch of drunk cowboys abused for 10 years. Bob |
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