Is it safe to assume the pin was not covered with a blanket or cardboard to protect it from sun/heat.

Out here in Arizona I basically won’t even move pins during the day in the summertime unless they are totally wrapped up. Underneath the glass, the play field will heat up like a convection oven unless it’s covered. It will warp the hell out of plastics, ramps, decals etc.
Same goes for cabinets with new decals.
If it gets really hot they will bubble up and ruin the art.

Given the heat I'm not surprised that happened. Really a shame. I can't imagine how frustrated you must feel.

It looks like you did not sand the original playfield down. I can see the old art under the decal. How long has the decal been applied? did you use the wet method? maybe moisture was underneath?

I'm really not surprised. Those overlays cannot handle heat.
Someone had even shown one of the overlays all screwed up after putting a coat of clear over it.
Watching some of the guys use that Hardtop overlay has me a believer in it.
-Mike

I'm not surprised, Classic arcades stuff is generally low quality. I bought that exact decal and the colors were so off I never installed it and it hit the trash when I sold the game. Playboy bumper caps from them look like crap but the only place to buy.

This is a fact and nothing new. It’s been well over 20 years.

Always last resort. Should be their motto.

Same thing happened to me on a capt fantastic.

The problem is that these overlays are terrible and should not be used.

Heat is the problem here. Mine was in a hot garage on the summer. Same exact thing happened.

Sorry, no good way out of this for you unless a hardtop or new playfield is made