my dentist gives me the material that they use to make dentures with. this is the hardest stuff you can get and is what Dave Guardala used but you need a mp that has the middle part indented so that this material can sit in there….in other words you can’t just smear it on a totally flat, smooth mp.
I can’t stand those rubber pads, they put an extra layer of height on the whole setup and of course I bite thru them easily.
on my new fatboy I’m just playing ojn the mp with nothing there…so far so good, I think the worst that I’ll do is scratch it.

I use runyon pads. I put on the soft black and then a clear on top.

i use go through those loads of little mouth piece pads i would bite through just as Michael said, and the cost can soon add up, anyway i i tried some helicopter tape the military use it on there helicopter blades in the desert, its used on protecting the vulnerable paint work on mountain bikes that sort of stuff,Its thin but you can get in different thickness i got a roll its 25mm wide just cut a little piece off it last ages very comfty you don’t know its on the mouthpiece. Best part you is you will only ever need one roll.