I used the hot glove all the time and every time you get done useing it make sure you double check for any cuts or kinks or any pinholes if there is one discharge it and get new one.
For pinhole all you have to inflate the glove like balloon if you hear a air leak then you got a pinhole that is good time to throw it away.
The newer gloves do have dual liner and they have specal colour underneth if got cutted or pinholed one of two it will show diffrent colour to warn it. The pinholes are tough to find it as I mention blow it up you can able find it then between 6 month to a year if still good shape you will have to take the glove to testing centre they will test with voltage graduent to make sure it still pass the test.
Merci,Marc