I have mentioned this in another thread of yours.  Buy some stealth mylar sheets from Pinball Pal.  Relatively cheap, look good, do a great job and piece of piss to remove if needs be.  It just peels off like a band aid but doesn't ever look like lifting or moving until you want it to.  You can buy full A4 size sheets or they have sheets with various shapes pre-cut in them.  I swear by them.  Not sure if Greg at RTBB stocks them as well?????