Hi,
I only use polyamide glue,its really nice to work with,and also nice(er) to remove,polyamide starts to break down as soon as the air makes contact with it,so best to keep it in an air tight container,but the plus side is it takes a long time,and it only starts to break down, wont disintergrate in the hair or anything like that, it just starts to soften, making removal easier,i used to buy from a hair extension company,and it was quite expensive, but sneakily peeled there label on that theyd stuck over the original and found its origins,so started buying it alot cheaper : )
Kate x
p.s, if the glue is accidentally left out in the open air before you use it, stick it in the oven for a while will dry it back up : )