This is the glue I am always singing praises about. Thought a picture would help you locate it easier than just writing down its name.
So far, after four years of using it, it has managed to stick any material I wanted to any other material. It is strong, slightly flexy for a while but gets stronger and stronger. It will stick painted or varnished pieces together. Can be varnished or lacquered, is waterproof when dry and is so clear I have always used it to put in clear acetate for windows etc.