First of you shouldn't be using a heat gun to seperate lenses from capsules. Sure it works but by the time you get one area melted enough to seperate and move on the area you just worked on like you've already said adheres itself back together. Put them in the oven the whole lense sealant melts uniformly, just my opinion though you can do whatever you want but it takes me about 15 minutes max to peel lenses using my method.