HI GUYS, I thought I'd add my 2 cents. I Had 2 avistars, now I have 2 avistar wings. I flew them for 2 1/2 years and never had any problems with the wings. Both had the ply wing joiner and I used 15 min epoxy. I agree that 30 min is stronger and would even suggest using it but one thing I think needs to be mentioned is not so much how much or what epoxy but how you apply it. Maybe this goes without saying but when I glue critical joints like this I " double glue" In other words you apply an even coat to both surfaces. This may not be necessary with the new epoxies but I've been building for 30 years or more and these types of joints have never been a problem for me. I also let them set for a few minutes before joining. Both of my avistars gave me a lot of flying time. I made many great landings and enevitably, more then enough mistakes to put them in a trash bag but both wings survived. good luck with yours. Feep