Actually, epoxy resin sticks poorly to acrylic and polycarbonate plastics. Most effective applications, are both epoxy and a mechanical means to lock in the plastic. I would use protruding slugs or the very least, lock it in mechanically.
Joe Cygan KR-2S Texas ________________________________ From: Mark Langford <m...@n56ml.com> To: KRnet <kr...@mylist.net> Sent: Wed, December 22, 2010 11:47:58 AM Subject: Re: KR> Canopy Gluing- Epoxy Steve Phillabaum wrote: >>I have a Todd's KR canopy and I sanded in a good scratch finish in the >>area of the epoxy and then sandwiched in the conopy between glass on both >>sides uning areopoxy. I don't think I could get it appart without some >>damage. Let us know what he has to say.<< That'll work fine. I would think most epoxies would stick just fine to acrylic after it's been roughed up with rough sandpaper to give it some "teeth". I think this is even detailed in the Bengelis books. I suspect those having problems didn't do the roughing part. I wondered about the quality of that bond when I did mine the same way (overlapping the acrylic by about 1.5"-2" all the way around, but there is zero sign of delaminiation anywhere. T-88 may not be the best choice because it's not very viscous and may not soak into as many of the scratches, but I'd bet it's still a pretty good bonding agent for glass. I used Aeropoxy, and can tell you that it works for sure, at least up to 240 mph. Another key is HOW you do it...you need to sandwich the acrylic on both sides with glass to put it in a sort of "double shear" rather than glass on only one side, eliminating a "tension only" kind of failure where the fiberglass can just peel away from the acrylic due to some wierd loading condition. I think that's just good common sense though... Mark Langford m...@n56ml.com website www.n56ml.com _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
