For me, the lamp ignites randomly. The gas can be as not as good dosing. Either it trundles to himself and then goes out or you get a flame that still herausspuckt the gas in liquid form. Perhaps there still when the cartouche losing some pressure, but Dolle is the blowtorch not anyway. I use them only to heat up the grill, so it's not so bad if Grisu alternates with Fume, but seriously so that I would not want soldering. As you flare rather from the hut.
