In reply to olddirtydoggy:
Personally I'd use a shoe glue (goo just being one brand). they are designed to be flexible while still holding. superglue can be brittle, and eventually crumble.
don't want to sound condescending, but, read the instructions. if it says apply to both surfaces, wait until tacky, then press together - then do just that (it's a mess if you don't, the surfaces slide around, and the glue doesn't take.
flexible glues often need a bit of moisture, so stick em in a plastic bag while they cure to stop the glue drying out.
the most difficult thing is finding a way to keep the two surfaces pressed together; in the right shape.