• I'll be using 9323 to stick it together, which is one of the strongest adhesives in lap shear. I need to do some sums, but it might not be the adhesive or the bond which is the weak point. My outer skins are going to be M55J UD fibre which is notoriously poor at sticking to anything. The weak point might be the boundary between the fibres and the outer layer of resin in the pre-preg - because that's how it typically fails when you peel it apart.