So I tried making fuse using epoxy and string where I mix finely powdered KNO3 with epoxy resin into a slurry, and apply it to string in a similar way as blackmatch. However it only burns reluctantly so I guess I'll need potassium chlorate. I know chlorate based flash powders tend to explode if you store them too long, does the same apply for all chlorate mixtures? I live in a very rainy area so blackmatch is kind of pain to use so I need something water resistant like epoxy, but if it self-ignites after a week then obviously it's not worth it. Any info much appreciated!