You just keep them wet and don't carry on vaping if the flavor / vapor goes down, keep topping up the filler, i've used Boge cartos ever since they came out, i've ripped a few of mine apart and even though the wick sleeve and a bit of the filler is a different color from heat on some parts, it's not burnt. I KNOW when i've vaped polyfill it's the most disgusting taste ever LOL, time to say goodbye to that carto there's no fixing them when you get to that point.