Tough and stable paper based and strong adhesive. It used for masking in glass frosting, back pasting on glass avoid splash of brocken pieces.

Take a loop of masking tape and tape the board, copper side up, to a piece of cardboard (eg. the back of a writing pad).

I photo-copied the decals 85% size by copy machine. Attach it back side of a transparent sheet. Put masking tape on other side and cut letters out.