I dont know what it is about Ambroid..When I first started building that was my favorite glue..It worked great..My first real kit was a Sterling Piper Tri Pacer. Glued almost completly with Ambroid..Some Trainer....But it was what I spotted in the hobby store and I didn't know any better...When I finished it and took it to the field the guys wouldn't let me fly it..It was too beautiful and beyond my skill leval...Anyway now when I try to use Ambroid it just will not work for me...I love the smell...I have tried to double glue when it soaks in and given lots of time for drying..I just cant understand why it wont work..I have tried fresh tubes and made sure that they were not old stock etc...I still have 6 tubes unopened...