Quoted from AtTheArcade:- Is there any risk in scratched the blades when I raise and lower the playfield in the future?
Depends on how tight your PF is with the cab and it's different on every machine. Examine the black painted sides and see if you see any marks or scratches. Sometimes you'll have a single part (like a PF support post) that sticks out a bit and hits in one spot. You can loosen the part underneath the PF and try to tug it back a bit to avoid this.
Still it might be a nice idea to have some large poster board kept handy to slide in each side so when you lift you won't catch the edge of the decal when let it back down.
I've seen quite a few machines where the interior decals (hate the term "blade" for a sticker) have that semi-torn "lip" on the top edge where the PF caught it going down.