Wyoming way has not been seen since the '50s. You forgot to include wiping the area with a gas soaked rag before the wire brush and the the hot patch. Worked at a real service station during school days. Fixed everything from large truck tires to car tires. Didn't have a cage so we put large truck tires under car lift to air up. We gave the customer a choice between patch or plug when fixing car tires. Different charges also. Never had a plug leak. We did have some tubes that were patched leak. But tires didn't last as long as they do now. Both ways are ok.