I get that and don’t disagree. And I can at least give him points for turning down a job that he doesn’t want to give his guarantee on. He’s a patch guy so he only wants jobs that are easy to fix and won’t come back so he doesn’t have to come back. Given the potential complexity of the rusting rebar issue, his services aren’t the correct way to deal with the problem.
Since this job is likely to cost more than a thousand dollar or so, it’s best to stick with licensed pool contractors that have experience with building pools. A plastering company is probably the best way to go because they’ll have the experience to deal with structural issues.
@Paddo_C - do you have any info on who built this pool? This is potentially a shell integrity issue and the pool wheel (gunite) is typically warrantied by the original pool builder for many decades and covered by the ROC. If you were to get those areas of plaster chipped out and it was confirmed that the pool shell had rebar too close to the surface, then the original builder may be on the hook to cover the shell repair. You could call the Arizona ROC and ask for their advice if you have details on who built the pool and pool shell. Check county records for a building permit to see if the builder is listed if you don’t know who built the pool.