Thanks again Wachara for your continuous help !
My present issue is that I don't know what is rubber glue (contact cement)...
Which of the following will be close to your own glue ?
Last but not least, none of the glues I've found, is conductive... My PCB rings with their copper trace have to be bond to the coated Mylar, but keeping the electrical contact... The only solution is to use a conductive glue, isn't ?