Have some shoes on which I'd like to add sole guards. Purchased soling sheet and contact adhesive. General plan is as follows: 1. Trace profile of sole onto cardboard. 2. Cut out cardboard template and trace template onto soling sheet. 3. Cut out rubber sole guard from soling sheet. 4. Rough sole of shoe with sandpaper. 5. Rough sole guard with sandpaper. 7. Apply glue to sole of shoe. 8. Apply glue to sole guard. 9. Attach sole guard to sole, apply pressure, and let dry. 10. Trim sole guard flush to sole of shoe. I've read about one guy applying three coats of glue to each of the sole and sole guard, letting the glue dry between coatings. I'm not sure why this might be preferable, as the layer of glue may become thick. Not to mention the glue is dry before mating the sole and sole guard? But I know this is done for some other applications unrelated to shoes. Am I missing anything? Helpful tips and tricks?