Epoxy is the absolute wrong thing to use anywhere on a tire, it doesn't flex. If you get a GOOD QUALITY plug kit, you'll be fine....Safety Seal or Black Jack, never had one of those fail. Get the kit with the reamer, lube and plugs and follow the instructions, no cement needed. People who have bad luck are using cheap Wal-Mart kits with lookalike rope plugs with little to no real rubber. A good kit will cost you around $75, but it's worth it to have plugs that actually work and tools that won't break, driving the insertion needle through your hand.