Playfield has to be completely flat and clean. Use compressed air to remove dust, as it will stick to the playfield and stand out. Use a dry method and take your time. Have a rag handy to press down the mylar.
Mike is 100% right - I remember the NIB KISS, Mata Hari, Eight Balls, Paragons were removed from their boxes and stripped of all their playfield parts. The contact was applied in one sheet and an exacto knife was used for all the holes for globes etc. He used a hand held dial press (as he called them), which was a cylindrical pipe with a sharp edge. This was placed over the area of the posts, and turned in a circular motion. It would cut out the contact, so that the posts were screwed down DIRECT to the playfield. If this was not done, the contact would turn and lift. Don't ever try to screw in posts ON TOP OF MYLAR. It WILL turn the mylar around the post.
The first machine I recall the contact being applied was Stern "Pinball" and "Melody Lane".
He used to apply the woodgrain contact, white or colored contact around pop bumpers on woodrails and EMs. He made the "effort" of matching the contact with the area around the pop bumpers
Thankfully, contact is REALLY easy to remove. The Paragon that was covered in 1979 had one wear spot, and the contact was actually two sheets, as it was not wide enough with one sheet alone ! I still have this machine in my gamesroom, and it is the best original Paragon Playfield I've seen.
