Listen to Miloh. Borzak is way wrong on his info. An epoxy gets all it's strength from the resin. The hardener is just a catalyst to cure the resin. In the building of simple model airplanes of wood or plastic, there not exotic epoxy adhesives used. Most recommend a 50/50 mixture of resin to hardener. But the same epoxy mixed 90/10 would eventually cure with equal strength with enough time.

No wonder boats don't fly.