This is my first post here on TFP, I was looking for some help on a first time plaster scratch issue we have come across in one of the pools we service.
The pool is a very dark gray plaster pool with about 7 years of life behind it. This past week we noticed multiple 2-3mm deep scratches near the entry steps from our weekly vacuuming. (either from a worn vacuum with protruding metal - or from a rock that was stuck in the vacuum head.)
The problem is the scratches are much lighter in color than the actual plaster so the scratches really stand out. The owner is not happy with the scratches and we are having a hard time getting the scratches to blend in with the darker plaster.
we have tried sanding area but this only makes the discolored area larger.
we have tried ascorbic acid which didnt work either.
we then tried part a+b epoxy to fill in the lines. unfortunately 'grey' color was much too light. before I buy another $20 package of a + b epoxy in black is there anything else we can do? i have a feeling the epoxy will not stick to the wet pool floor very well.
draining the pool is not an option. 25,000 gallons of water is too much for a cosmetic scratch...
please help, the pool owner is not happy.