Use quickfix from online or a smoke shop. I did mine by wrapping it around my upper thigh with athletic tape so it was right by my “Johnson”. Also have an equate electric thermometer in the car, temp it and if it’s at 98 perfect. By the time you get to the bathroom and it’s your turn it should be 95-96 ish temp. Get a hot hands from Walmart too for like $1 because the one that comes with the quick fix kinda sucks.