I found with my protank builds that dryburning and reusing coils isn't as great as I first thought. You get a good run off the first fresh build then after you poop the wicking, dryburn and reuse the coil it doesn't last as long the 2nd time and so on the more times you dryburn (reuse) the faster the coil craps out afterwards. I just rebuild the whole setup now and IMO get more mileage out of the coil than reusing, since the subtank are quick to rebuild. I use a lot of 30 gauge wire for my wife's tootle puffing and I'm assuming the thinner the wire the less tolerance it has to multiple dryburns. I use 26 and 28 but so use to tossing build after its time I'm not sure about repeated dryburning of the thicker wires. They say the subtank insulator burns real easy but I was tossing the spent builds without reusing back when I was still using protanks.