Dubi, the very best thing I have found to glue polyurethane, pvc divincel type foams together with is expandable urethane foam. The kind that works very well is the canned kind that you can buy at the lumber store used to seal leaks around your house for insulating electrical box air leaks or around windows or doors. What I do is spray a bead down one of the edges to be joined together, then take the other piece and rub the two edges together, it smashes the expanding urethane down into a sticky messy glue. Now just hold the two pieces together with hands or weight them down until it cures,usually doesn't take that long. If any expands up out of the seam just wipe it off as comes out. 15 years ago when I built the top cabin for my Defiant it required multiple pieces attached together to make it across the whole roof and top cabin sides. That was the first time I had decided to try the canned foam on an airplane part I think. I do remember the first time that I could pick up the two big pieces glued together like that and bow them and the foam would bow as if it was all one big piece. It did not try to deform on that seam nor would that seam break. Prior to that on my Longeze I had used hot melt glue and it will work but it is not nearly as good as the canned foam. When gluing foam together to hot wire, the urethane can be hot wired right through. In the old days we were told to mix up micro which is a mixture of resin and microspheres (glass balls) and glue the pieces of foam together with that before hot wiring out the wing shape to be fiberglassed over. When hot wiring out solid foam wing cores the cured epoxy gluing the pieces of foam together could cause a mess if your hot wire ran into it, because it (the hotwire will not pass through it. This is a reason why I like the urethane foam. I have not tried it yet but I think the Gorilla glue that has been talked about will probably do the same thing. Just make sure you lay wax paper or handiwrap on your floor or table where the urethane glued together seam will be while it cures. Larry H.
dubi gefen <dub...@maanit.org.il> wrote: Hello KRNet When I glue two pieces of polyurethane and I filing with sand paper I cannot get nice flat surfaces. The reason is because the glue is much more hardener comparing to the polyurethane. How can let me know how to makes this job well. --------------------------------- Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail.
