Knitette in her reply said it is difficult to purchase in England and I'm sure to buy in USA would cost an arm and a leg to post. I will keep looking.
I have tried it with a dry iron wet starch on fabri and a cotton tea towel around a piece of wood. It definitely made a lovely looking seam. I fact the wood kept on working on othe starched areas wilt the iron. I did not press hard just lay it on top and it did a great job. I think a cousin will be a useful phone call.
Thank you everyone.