Honestly, I wouldn't iron it at all if I didn't absolutely have to. If it looks good and is secure when you finish, let it be. I am not sure if it would adhere or not; never tried it. It would be wonderful if that is all you had to do & it would turn out perfectly, but unfortunately, some things like leather no short cuts are allowed. Me personally, I'd probably try my glue gun before I'd consider ironing on it. :lol:
A 10 lb jacket!? For a motorcyclist?