Spark plug wires should not overheat from the electric current, so I would be supspicious of an exhaust leak or some other outside heat source causing problems. Where is the wire burning?
Broken spark plug wires will keep almost any car from starting.
Water around the outsides of the spark plug may keep the car from running due to poor spark plug wires, but the engine should still turn over.
because you did it wrong
Chase the sparkplug wires back to the coil pack. Depending on the size of engine is going to determine how many wires there will be. Keep in mind where you unplug the wires from the new wires will need to go back the exact same way to keep the firing order the same.
I would help to know what year and model vehicle you have but, you may have a bad fuel injector.
The silicon stuff is to help keep the spark plug boots from sticking to the spark plug, so put it in the spark plug boot.
well on how to route the spark plug wires, you just need to keep them away from the exhaust, and make sure to keep them away from any moving parts in the area. Zip ties work wonders on these, and just ensure that they are in their correct location for the corresponding cylinder.
Wrong heat range plug for the fuel and/ or riding conditions
Replace the spark plug wires, too much resistence in the old ones.
There is not a lot of information to go on from the question as posted. When an engine is in proper operating condition, the spark plugs should not be "wearing out", on a regular basis. From the information at hand, I would suspect the wrong heat range plug is being used. Check to see what spark plug the engine manufacturer recommends for your engine.
You did not specify year so I will assume it is an older one. If it is spark related then a cracked distributor cap ( so small you may not see it ) or rotor, and dont forget the plug wires, one or more may be bad or grounding against the engine before the plug. I suggest replacing them all ( cap, rotor, and wires ) then check timing.