The delamination is generally due to rapid heat, and humidity changes. This was a popular theme at arcades so it most likely was left on for 8 to 12 hours each day it was earning money. Also the wrong light bulbs which would produce to much heat, could of been installed at one time.

If it were mine I'd be tempted to use Triple Thick to seal it and use some warm white LED bulbs in the back glass (close to the look incandescent bulbs without the heat).
I have a Charlie's Angels and my back glass is a lot worse than yours, the majority of the red in the sweater has flaked off. While I did touch up mine - its still not great, yours is so close to perfect in comparison that I'd probably leave it as is, until you can find a better one if your that worried about it.

Mine is in pretty good shape too, but I sprayed about six layers of clear on the back before I hung it up on the wall. Same goes for the Close Encounters too. Rather be safe then sorry.

John P. Dayhuff
Battle Creek, Mi.
269-979-3836

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Your back glass is showing the beginning signs of starting to fake off. Your failure (small puzzle pieces) in my opinion is a good candidate for triple thick. I get worried when the glass is delaminating in large sheet like sections as the triple thick cant attach itself to the glass at many points and you get bubbles.

Read up on doing a triple thick, there is some risk to doing it.

Yep, seal it. It's only going to get worse.

Here's a summary on the procedure:

http://pinwiki.com/wiki/index.php?title=Pinball_Restoration#Sealing_the_Backglass

Long story short--During the 12 year search for the game I picked up two NOS backglasses and two NOS playfields all for the EM. version. Once I found the game I never got around to installing the playfield before I sold the game after owning it for 5 years and the reasons I sold it I regret now that i look back at it but whats done is done. I let one playfield go with the game, the other playfield and a backglass went to France and this glass I've hung onto just to hang it on the wall and its NFS. Thanks for asking though.

John P. Dayhuff
Battle Creek, MI.
269-979-3836

I haven't really found the best approach for colored windows yet, myself.

Some just spray over them, but they will look a bit cloudy.

Some cover them up with carboard or lexan and weigh them down. Cardboard doesn't work well for colored windows, since the triple thick will bleed under it a little bit. Not a problem for clear windows, but for colored widows, it doesn't look great.

Some just scrape the color off, and then just treat the glass as is if it had clear windows. Then, put tinted plastic covers on the displays: http://www.pbresource.com/lampcov.html#dmdc

Also, there is adhesive vinyl option for the score windows. It looks like you can get that material on ebay, since pinballpal is closed.

https://web.archive.org/web/20140422232214/http://pinballpal.com/products/gdisplay/

https://pinside.com/pinball/forum/topic/wtb-pinball-pal-blue-score-window-filters
ebay.com link: Any Color Transparent Vinyl 3 sheets w Adhesive 8x12

[edit]: I found someone who sells them cut to size, though slightly on the pricey side: http://www.actionpinball.com/parts.php?item=PDG377