If the rebar is exposed the integrety of your shell has deteriorated, You should start over,Tear it out. If you just cover it over you would most likely have long term problems.
Rebar and or ties exposed in a gunite/shotcrete pool shell is bad but not unrepairable. The exposed steel can rust, and may bleed through the plaster leaving a stain. It may also cause the plaster to delaminate in that area. To remedy the situation the rebar and ties should be cut back or ground out and into the concrete. Hydraulic cement can be used to patch over the areas before the pool is plastered.
No, because gunite will not dry if it is constantly being mixed with water. Drain your pool first.
Gunite particles can be dangerous to health. For workers routinely exposed to the particles, OSHA says that silicosis can develop.
No
Gunite
No, Gunite is a type of concrete.
By Gunite I assume that you were told you have a gunite pool, The gunite part is the foundation of the pool and does not require watering. The surface which is plaster over the top of the gunite needs water. If you just had your pool replastered in the last couple of days it is critical to fill it with water so the plaster can dry. If your plaster is older and been under water before a few days is not going to hurt. Although you do want to get it full of water as soon as possible. Kenny Kummer Brody Chemical
Gunite is a trowled-on cement coating similar to stucco.
"Gunite" is a special concrete mix that is sprayed, with a specialized spray gun. Using Gunite requires, by definition, the use of the spray gun.
I general, the answer is yes. It the crack comes from the pool moving, and the gunite has cracked, then the gunite has to be repaired before the plaster. Sometimes opening up the gunite crack and refilling with concrete will answer the problem. If movement of the soil is the problem then that has to be fixed first.The soil getting excessivly wet and dry can mean that the pool will move, if it is only part of the pool then there will be a structuaral crack. Only opening up the crack will tell you whether it is a plaster crack or a gunite crack. A replaster is from about $2000 up and structuaral repairs from about $1000
If it was working ok before you lined it and you have no problems removing the liner you should have no problems.
The former name for gunite is shortcrete. The term gunite is used for spraying concrete or mortar in a wet or dry process using a patented gun type applier.