WHEN BUILDING WOOD RIBS I PAINT ALL THE GLUE AREAS IN MY WOOD RIB JIG WITH POSTER PAINT THEN IF THE RIB GLUES TO IT IT STICKS TO THE PAINT AND NOT THE JIG ITS WASHABLE..SANDABLE A PUTTY KNIFE TO PRY IT LOOSE' ALSO WHEN RIBS ARE FINISHED GIVE EM A GOOD WHACK SPLAT FLAT ON A TABLE OR FLAT WORK SURFACE OR AN ALMOST DESTRUCTIVE TESTING IF IT'S FIRM ITLL HOLD TOGETHER IN THE WING