First, any fingerprint or any hint of oil will cause problems as it prevents the CA from penetrating as it should. Second, the hing is stiff and you have to "break" it to get it to flex after glueing them. I've seen to many of them rip, or pull out. One guy last week was walking his plane to the flight line and the rudder popped off. One hinge had signs of CA penetration, but the other three only had a narrow band CA along the hinge line, it didn't penitrate the full length. Builers error?? Could well be, but they lead to that.

Will my nylon hinges pull out. Yep, I hit a fence last thursday and ripped a wing off. The aileron on that wing pulled loose. Four hinges. Three pulled major hunks of balsa from the aileron, and the fourth broke in half. Today a guy found a plane of mine that had been missing for three months or so. It went into the creek bed behind the field like a lawn dart from real high. The bed is so overgrown with vines and brush that by the time the plane got to the ground, there wasn't much left. The engine was not to be found, nor the wing or landing gear. The fuelage was broken in half. The stablizers were ripped off even with the fuse and the only flying surface found was the rudder. All four pined hinges were broken at the hinge line. They didn't pull out of the rudder, or out of the vertical stab. I'm sold on them. I just don't give hinges a thought when checking out my planes. I know they are solid.

As the adds go though, you may get different mileage.

Don