How can a seller guarantee this?

[Kim Durst]

We’re under contract on a pool home in Florida. After two inspections on the swimming pool, we were informed that the fiberglass coating has failed. The pool needs to be drained, sanded, and resurfaced or coded.

seller is offering 10k but then wants us to take the home as is. I say no way. 

it’s going to cost anywhere between 8000 and $12,000. Obviously, we are insisting that the seller take care of this however, I would love feedback on how you would go about it. 

Worst case scenario, they drain the water and find cracks or more damages and costs rise. I’m not even remotely interested in this. 
Po companies are booking to three months out so this can’t be done until after close. What would you do?