Sika 295 UV is a fast curing, one-component, flexible, high performance polyurethane-based adhesive bonding polycarbonate and acrylic windows, or sealing open joints between glass, ceramics, fiberglass, metals, as well as many types of plastics and paints.
This 1 part polyurethane sealant air cures to a durable elastomer. It is suitable for all types of organic (PC, PMMA) windowpanes. 295UV also provides superior UV and weathering resistance. Use with Sika primer 209.
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SikaFlex 295i UV Features and Benefits
No added solvents
Excellent UV and weathering resistance
Suitable for organic glass like PC or PMMA
Resistant to seawater and fresh water
Elongation at break (DIN 53504)
Tensile strength (ISO 37)
+50 F to +95 F (+10 C to +35 C)
Service temperature (continuous)
-40 F to +195 F (-40 C to +90 C)
Service temperature short term (>4 hrs)
250 F (+120 C)
Hand- or air- gun
*=at 23 C and 50% relative humidity
Below Water Line (yes/no):
Rate Of Cure:
Can 295-UV be used to bond polycarb to varnished wood window frames? (I read about bare wood and painted surfaces, but no info on varnished substrate)Thanks
Karl KrugerSent: Thursday, May 31, 6:15 PMI used this adhesive on the windscreen on the airplane I'm building. I think it's a pretty safe bet that if you use the primer and activator that it calls for, it will work great for your application. I would tape off where you are applying it and rough up the varnish and the polycarbonate both just a bit where the adhesive will lay. Hope that helps.
It seems that it would adhere to just about anything. I used it to seal the base of railings on a roof. The railings were painted and the roof had a rubberized surface. So far, it's holding back any leaks. I also was getting ready to use it on boat windows. Hope this helped a bit.Karin S. Dutkiewicz503 W. Market StreetVevay, Indiana 47043-1064
I wouldn't bond any sealant long term to varnish, since the varnish will eventually break down and break the seal.
This may depend on the varnish. You may want to reach out to Sika directly with your specific type of varnish, so they can verify.
JD Tech Associate
Can I use the Sika 295 UV for frameless bonding? I have 1/2" thick poly-carbonate windows 11" x 26" and I want to install them without having to screw them down. I've got an inset epoxy flange so the windows will be flush after mounting. I want the right sealer adhesive to install the windows with no screws or frames.Thanks, Chris
You can use Sik 295 UV and may need a primer/cleaner to ensure a good bond.
JD Tech Team
is this what I need to seal polycarbonate to untreated wood? This is a greenhouse.
Yes, that should work well.
I need to run a bead of something along the underside of my Teak rail to keep water outta the boat. NOT to bond the rail to the boat, its already been there 34 years.Several years ago I used 5200 but it didn't hold up well in the Sun. My boat is in S Fla.I'm scraping that old stuff off with the back side of a chisel.Sikaflex was recommend by someone here in St.Pete. What is all ya'll opinion? Which one to use?
I have installed 3 windows with Sikaflex. No leaks. No problems. It's the UV I'm wondering about.
Use sikaflex 295uv you will not be disappointed. It's held a windshield of my airplane on at 200 knots.
I also was a 5200 user and with that being said, I bought a case of sikaflex to seal the plexiglas windows in our 50 year old Countess44 and I must say the job was messy, but came out far better than we expected. No leaks and fairly easy to clean up. I can't walk down the dock with 5200 in a sealed tube without having it over 90% of my body and hair. Pay the money for the Sikaflex and get her done!Craig Harnden
295UV has held up well for me. It has held the plexiglas in my hatch for five + years with no visible deterioration.
Ordinarily I would recommend sikaflex but the last two times I used sikaflex it did not stand up to the sun. It cracked and did not seem to go off. It was sticky and gummy under the skin which cracked.
My friends & I agree that 5200 is an Alien life form that can move through space & time. Thanks.
what sikaflex to use when sealing wooden boat decks ?
One of the best products on the market.
What varnish has anybody used to apply over the top of this?
I applied Interlux Urethane (Brightside) over the top of it. It took forever to dry. After six months, it seeems like the paint still isn't dry.
I didn't use any varnish so unable to help.
JEFF A MITCHELL
No experience with varnishing over Sikaflex, but I can't imagine you would have a bet long lasting result due to the elasticity of Sikaflex and the lack of same with varnish
Will this caulk work to bond on rubber? My acrylic window is surrounded by rubber and I need a caulk that will adhere to both acrylic and rubber. Thanks.
I don't if it will bond to rubber. I assume it will. I used it to bond Lexan into my aluminum hatch
It worked great for my application I applied it to a rubber spoiler on my car. It adhered perfectly and I was able to sand and form it as well.
I am completing te construction of a 70' steel schooner. I have 12 hatches. each with steel frameworks and polycarbonate plate panes. Once the steel is sandblasted I want the correct primer and adhesive.It appears that SIKA 209 is the correct primer and SIKA 209 UV is the appropiate adhesive.Am I correct?Thanks
I used 295 UV with great results. You will need to have a gap between the steel and the polycarbonate to allow for the difference in the coefficient of thermal expansion.If you bond the two materials directly together, the SIKA can't flex and a crack occurs with the ensuing leak.My application was between fiberglass and polycarbonate so the difference was greater than yours.I called SIKA's support number and talked to one of their application engineers. They couldn't have been more helpful.
Not sure i applied to aluminum and polycarbonate and it worked fine.
is this gasoline proof?
It has a temporary resistance. Google "sikaflex 295 and gasoline", look for westermarine dotcom for more information. This site will not allow links!
After curing yes it is.
Is Sikaflex 295UV the appropriate product to use for re-bedding 1/4" laminated safety glass in bronze portlight frames? Thank you.-Richard Darling
Yes, I've had great success with everything I've used Sikaflex for. The price is high, but "you get what you pay for".
I have used it to bed Plexiglass in an Aluminum frame. Worked great. Not sure about adhesion to glass. I would give Sikaflex a call to be sure.
This is the best caulkimng for setting exterior windows with
Thanks for the free shipping on the last order. Another comimng soon
I will use Sikaflex 295 again for sure.
Product was great but Jamestown Distributors failed to send me the screw on dispensing tubes (as pictured) the last couple of times I ordered this product from them. This is a problem because no one around me sells just the screw on tubes for this or similar products.
Sikaflev 295 FAILURE!
The UV designation is a joke. They recommend that a UV tape is used to shield the uv rays from destroying the primer bond to the glazing. Also after only 2 years the windows started popping put after a trip to Bermuda and the other vessel cruising offshore East coast to the Keys. The Sikaflex system was used on a Dean and an Outremer catamaran. Both boats had catastrophic failure of the seal.
Florida and RI
Expensive, messy. Watch vises on utube first. Use thin gloves, lots of thinner and plenty of tape to pull off excess
I used the product to repair some swimming pool slate that kept falling off. The product was used to seal the top of the slate to the wall of the pool.
San Jose del Cabo
Mask off area well
This stuff is thick. I used a cheap caulking gun and my hands really got a workout squuezing the stuff out. Get a good caulking gun!
Little River, SC
Works extremely well!!
I agree with the others as to the messiness of the product...especially if you aren't careful with it, or fail to tape and mask your work areas. Other than that...It does the job extremely well, and it was easy to use. I have re-bedded the windows on our trawler and they turned out great. I like the fact that after 6 months in the Florida sun much of it summer and full exposure to the sun...there has been zero fade, bleeding of color, peeling, or separation. I am very pleased with this product and the way it turned out!!
Punta Gorda, FL
Replace fixed windows on Catalina 30
Watch the video and look carefully at the plastic tip before cutting so you understand the upside down V. Try on a test board first. Its not difficult but merits some practice. The actual installation went smoothly. Ended up with clean lines and water tight seal. I used four screws in corners rather than the ten I'd taken out on my Catalina.
New London CT
The Sikaflex program works well!
I replaced my screwed in acrylic windows with Makrolon (Lexan with abrasion resistant coating) and used the Sikaflex 226 cleaner, 209 primer and 295 UV adhesive and the results were unbelievable! I did not have to use the screws again making it an even cleaner install. Only advice I can give is tape it off well so when you remove the tape and paper your left with a nice trim line around the windows. This product works very well!!
Great for acrylic windows
Installed 16 acrylic windows in my homebuilt boat with this stuff, following instructions for sanding edge of acrylic, and priming. Tools easily into a smooth bead. Most of the work is in the prep for this use. Boat has been in the weather for 5 years now without any problems with window seal or adhesion.