Didn't have one big enough. Then it comes down to which will be more useful in the long run, a propane torch or a high wattage soldering iron. As pointed out previously, the torch has a multitude of uses. The soldering iron, not much unless you're an electrician. I'm also not sure the iron would have made a difference. I don't think the kerosene ignited directly from the torch flame. I think it got hot enough to ignite on its own. I'll be the first to admit my soldering skills are seriously lacking. I probably got the fount a lot hotter than it needed to be.So why use a torch to solder the fount on the lantern? Why not use an iron?
I honestly thought the kerosene had fully evaporated and if there was any remaining in the folds it would be so little as to not be an issue. It's not like it exploded. There was just an unexpected whoosh when it ignited. I let it burn off.
Aside from the open flame around containers that used to hold flammables, I think the lesson here is to always buy the painted kerosene lantern. The paint helps fill the voids in the seam. I saved a couple bucks with the unpainted one but ended up spending more on solder than I saved on paint. On the plus side, I now have a propane torch for various projects around the house, including the lighting of individual briquettes when needed. I used it for that on my last "snake" cook.