FLATTENING THE PLAYFIELD BETWEEN COATS:
Everyone has the idea in their head that each coat of clear "fills in" or "levels off" dips and depressions in the playfield, but that is not true at all.
There is a cohesion tension that breaks up the surface tension of the clearcoat and causes it to wall up around holes and slots.
You need to sand down this build up between EVERY coat of clear.
Also, little dips in the playfield around pop bumper nails, sunken inserts and fisheyes will not just fill in by spraying over them. You need to de-gloss these areas, and fill them using an eyedropper with 2PAC.
Here we have the first coat of clear on a playfield.
I've gently sanded it with some 800 grit paper on a sanding pad to show any low spots. The sanding pad is flat so it really makes the low spots evident. If you sanded by hand, the sandpaper would just follow the contour of the playfield, never showing how uneven it is.
Note the insert that "felt" flat to my hand before clearcoating, now shows it is sunken and needs to be filled. I'll rough it up with sandpaper by hand, and fill it with an eyedropper.
Note the build up of clear around the drop target slot. This I'll sand back to flat before the next coat of clear.
Here again we see some shiny low spots around the pop bumper nails and just a random dent in the field. You can see that the tip of the 3rd arrow insert has a low spot in front of it too.