Worn Fiber Glass shower pan

hi, need some help! This is an original stall shower pan that is worn out in some places. There are black areas, not mildew, rough areas where finish is gone. The stall is completely tiled and they're in good shape. In order to replace, you would have to pull tile....Not an option...

Is there some way or product that I could use to refinish the surface??

Thank you in advance for any logical solutions to this problem Mikeb

I would look for a tile installer who can either tile over the pan or cut it out.

The only good, long-term way to resolve this is to tear out a few rows at the bottom of the shower and put in a new pan, then retile that section. It could be tiled or a receptor, your choice. A new liner needs to come at least 3" above the top of the curb.