You can't stitch Mylar designs on WSS, their two different materials.....WSS disolves and Mylar does not....Mylar is like what you see around Easter basket or gift baskets (kind of like cellophane)...hopefully someone will explain better....you can check online for Mylar.

Offenbar ist das Material hier noch nicht so populär im Bastelbereich, vielleicht hast Du ja in guten Baumärkten Glück.
Obviously the material isn't popular for crafters yet- maybe you will find it in a good hardware store.

ichbines I ship mylar worldwide and have already sold to Germany, South Africa, Denmark, The Netherlands, Belgium, Australia and the UK. I am based in the USA and would be happy to supply mylar to you. The opal one is fully washable and can be dried in the dryer. The link supplied by evajungermann is for the mylar for hydroponics. it is not the same mylar. I hope this helps. I have put a link to my site which explains all about mylar and also has a tutorial along with lots of mylar for sale in the webstore. Regards Sharon