Well, you would just have to keep checking on it until it took the amount of dye you want. I use rubber gloves and wipe everything down with alcohol. I always dyed a lot of stuff at once so I had an old cooler to dye in. I heat the dye and water mix, dunno if it's necessary but it's just what worked for me. I also wipe with alcohol after the process; just to make sure it doesn't have any residue left to dye my hands.