We had on pool chipped out and redone within days of the first plaster job was done. They put a WAY wrong color and none of the extras the PO had asked for so no worries there.
Will they be doing a full chip out or just around the lights, returns, skimmer, etc?
There is one PO who just had a place on his spa seating redone due to a crack. It REALLY showed how much the color of the plaster had faded. I am saying that to have you think about staying away from the dye. I think, notice I said think, the black stones will really help your color. I did a search for black beads and the color difference was noticeable in the pictures so.........hoping it will be in real life also.
The cost of the additives? I really don't know and am not sure how you could find out. I guess you could call other PB and ask them what they would charge for it to get a baseline.
So glad you were able to enjoy the spa! Nice on the speed of it heating up! Must have been nice!
for you while you decide what to do.
Kim