Urban Crafter Butane Heating Flame Torch Can be used to remove bubbles on epoxy resin work. For best results, the torch is to be used at around 15 to 20cm away from the surface of the artwork in a sweeping motion to avoid scorching the surface. If the flame is applied too closely to the resin surface, it can cause dark marks that cannot be removed. These can be attached to a 220g butane gas cylinder that is available at most Hardware and Camping stores.