Can you elaborate on what you mean? Installing mylar doesn't really take cosmetic skill. But, that said, it does adhere lightly to the playfield, so depending on how the touchup was done (whether it was clearcoated, etc) mylar may be difficult to remove down the road. The playfield protectors are about as easy to install as it gets. Personally, I'm not a big fan of how the ball travels on them though. I feel like they impact gameplay a bit.