FWIW, I have fixed playfield pooling with the ironing tool and it worked great for me. I have also repaired areas with chipping by using thin, clear, water-based super glue. I glue down as much of the chipped off or lifting artwork as possible by applying the glue with a small paintbrush, pushing the glue into all the gaps. Then brush a small amount of glue over the damaged area to seal it all in. I usually can't even see the line where the glue begins on the original clearcoat. Depending on where the damage is, I'll then cover it with a cliffy or mylar for extra protection. I haven't added any washers, but have used wider posts in some places. I'm not sure how well it would hold up with narrow posts that take direct ball strikes, as I haven't had that exact situation, but I have yet to have one of these repairs chip away again. YMMV.
**edit for clarification** I am not ok with any of this and it does not make the pf as good as new. I haven't bought a NIB game in over 5 years because of my experiences. It's complete b.s. and needs to stop. This is just how I made the best of some bad situations.