Spots on Plaster

[d_red1]

Do these spots look like rust stains? This is day 3 of water and noticed these today. They don't seem to want to brush away. Gunite shell sat for 6 months and had standing water in the bottom several times with no signs of rust and now this pops up after I plaster. Plaster start up guy came today to do another acid bath and brushing and will be back tomorrow.

 

[onBalance]

Yes, they look like rust stains. Probably a very small piece of iron fell into the pool and made several rust stains

 

[Zamsaf]

I have these in my new pool as well. How do you remove these?

 

[d_red1]

Okay, that puts me at ease. I initially was thinking rebar or tie wire was rusting through already and I was about to lose my mind. Now, as Z asked, how do we get rid of them?

 

[onBalance]

Use Wet&Dry 100 grit sandpaper.