good call... I'll remember that... although my intent is to focus on a wide variety of techniques so that the arsenal is there. Admittedly the sample I set on fire was deliberately chosen to go up in flames....
Heat sealing is a very valid technique particularly for pack cloth and the heavier fabrics. I've done lots of it.
For the record, the French seam was shown on a very light rip stop I think it is silnylon
but I won't swear to it.