I recently spent a lot of time researching squib designs for a short film that I am working on. I found that most designs were unreliable, unworkable or expensive. I did find several designs that mine ended up being a variation of which use model rocket igniters. But for my purposes, which involve a lot of squibs, this would be too expensive. I decided to find out how to make my own igniters and came across this great site to which I owe a great debt of gratitude to. Using their recipe for igniter goop and the inside of an old hairdryer, I was able to make igniters tat cost almost nothing.
Please note that I am not a professional anything, let alone a pyrotechnican and I take no responsibility for anything that happens from you trying to do what I have done. This is a very dangerous project if not done properly and all possible safety precautions should be taken when attempting it.
That being said...