Would this work for fine hair? I have naturally wavy find hair and the slightest bit of moisture and it starts kinking, it drives me mad
Yeah I'm sure lots of fine haired ladies successfully do a BKT. You've got to ask yourself whether you think your hair can a) withstand the chemicals and b) whether it can withstand the searing heat of the straighteners. If your hair is breaking I would leave well alone until the damage is repaired.
Also bear in mind that the BKT hair will go back to it's normal texture eventually so you will need to re-do it at some point. The good thing about BKT is it's full of keratin (protein strengtheners) which will make your hair strong and resilient. I wish I could do it but I already chemically process my hair...