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Boat Forum / Building / October 2006Adhesive/Sealant for Lexan Windows
Does anyone have any advice on what Adhesive/Sealant to use to attach a Lexan window to a steel hull boat? I tried using 3M Marine Adhesive Sealant 5200. It did not bond with the Lexan. Any thoughts or recommendations? GE, manufacturer of Lexan has a great webpage and is very specific about the material to be used in sealing Lexan. Dave " > Does anyone have any advice on what Adhesive/Sealant to use to attach a > Lexan window to a steel hull boat? I tried using 3M Marine Adhesive > Sealant 5200. It did not bond with the Lexan. > > Any thoughts or recommendations? I used Sikaflex 295 on the 15 windows in my catamaran. Go to the Sikaflex website and check it out. With the Sikaflex cleaner and primer it is a complete system mainly for sealing lexan or acrylic windows. Supposedly this sealant is used without fasteners for lexan windows in military vehicles. fritz Take a look at a 2 part polyurethane that comes in a small dual tube with plunger. When you press the plunger the two parts mix and dispense very easily. We use this to bond polycarbonate to polycarbonate and have had great success. Stay clear of any glues that are generating a chemical bond to the P/C. Any glue that "attacks" the P/C will cause stress cracking at a later date. (or at least this is what we found.....) Check GE's site...good idea...and check 3M's site and others for the glue. Call and ask detailed questions.... Good luck, Marshall PS...make sure that the window material is not just polycarbonate but that it is UV stabilized and explain that you will use it for a window application. Though acrylic is more fragile it will/should hold up better than P/C as far as sunlight. Most outdoor signage is made from Acrylic due to better UV properties. There are some window materials that have thin layers of other plastics to help with minimizing scratches. > Does anyone have any advice on what Adhesive/Sealant to use to attach a > Lexan window to a steel hull boat? I tried using 3M Marine Adhesive > Sealant 5200. It did not bond with the Lexan. > > Any thoughts or recommendations? Have a look at Sika's product called Sikaflex 295uv. http://www.sikaindustry.com/tds-ipd-sikaflex295uv-us.pdf You will probably need to use the primer with it on sandblasted steel. I would give them a call and talk to the tech services group. They will know for sure what to use. Dan > Take a look at a 2 part polyurethane that comes in a small dual tube with > plunger. When you press the plunger the two parts mix and dispense very [quoted text clipped - 24 lines] >> >>Any thoughts or recommendations? MarshallE wrote: > > Take a look at a 2 part polyurethane > > We use this to bond polycarbonate to polycarbonate and have had great > > success. Does this allow >1/8" of adheasive for movment of structure? >> Stay clear of any glues that are generating a chemical bond to the > > P/C. Any glue that "attacks" the P/C will cause stress cracking at a later > > date. (or at least this is what we found.....) Many webpages list chemicals/cleaners that poly carb must avoid or are compatible. Jsut do your homework. > > PS...make sure that the window material is not just polycarbonate but that > > it is UV stabilized and explain that you will use it for a window > > application. There is a "UV protected" poly carb avalible. Some companies accomplish this by applying a laminate "layer" on one side. The tech guy I contacted said if the lexan is flexed the UV laminate will seperate form the lexan. >> Though acrylic is more fragile it will/should hold up better > > than P/C as far as sunlight. Ya but when you go to tighten a linse on a curve the plexiglas will crack. Not so the lexan. >> Most outdoor signage is made from Acrylic due > > to better UV properties. There are some window materials that have thin > > layers of other plastics to help with minimizing scratches. I used Dow Corning 795 on (6) lexan 3/8" x 7" x 15" lenses. Through bolted to house with (14) MS PH Philips 316 1/4" x 20 x 2 1/2" bedded in 1/8" Dow Corning 795. Do your research. Search this site and rec.boats. crusing for tons of info. Bob |
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