Guess I may need to buy a hair straightener, but I do own a hardly ever used curling iron, you think that would work. Think it is about 25 years old now.
Hey Danil,long time,no chat

,I think the straightener works as good as it does because both plates get hot,then when "clamped" on the mylar seam,it melts the glue from both sides without overheating or burning the bag.
My wife will hold the bag for me pulling the corners out to line the seams up and then I seal the whole mid section and one end leaving enough room at the other end still open to squish as much air out as possible and slip a couple o2 absorbers in,then just seal the end and it's done.I'll also take and run the straightener down the whole seam a few times to make sure I got it all.Works perfect everytime and looks like a factory seal when done.Much easier than an iron and don't know how a curling iron would work.I bought a new straightener for sealing bags only at the dollar store for only 6 or 7 bucks.
Also,for smaller bags,like little ammo pouches,i'll just take a 1gal bag and cut it in half or into fourths,seal up 3 sides,fill,then seal up the top.Thats what I did with the bags I ruined with the regular iron.And the big 30" bags for buckets can make four or more decent sized bags by cutting them up.I ruined quite a few with the iron,lol,but I wasn't gonna throw them out just because I burnt a hole in some.