No
You can apply paint if the humidity is less than 85% (except ethyl silicates) and surface temperature is above 3⁰C of Dew point. Application at temperature below 5⁰C is not recommended. For ethyl silicates, minimum humidity is 50% and max is 95%

No
You have to use the recommended thinner.

There will be excessive spray fog and orange peeling in case of less dilution and sagging in case of excess dilution of paint by thinner during application.

No
Surface should be free from dust, rust, loose flakes, oil, grease and all other contaminants. For better performance, we recommend blast clean the surface to Sa 2.5 BS7079: Part A1:1989. Manually prepared surface should be to a minimum standard of St 3 BS 7079 : Part A1 :1989.

Hold the gun at right angle to the surface and move parallel to surface. Keep the spray gun at about 1 feet distance from the substrate. Use the appropriate spray nozzle and set the pressure based on the paint type. Apply stripe coat by brush or roller on difficult areas like edges, corners, holes, welded areas before spray application.

No
You can’t use paint after the pot life is over. It will affect the final performance. It is also not recommended to dilute the paint and usage after it's shelf-life.

The end of pot life is signaled by exothermicity and double the initial viscosity/thickness of the product to the final gel stage. You can expand the pot life by mixing and keeping the mixed paint at the lowest temperature possible. A 10⁰C rise in temperature halves the pot life and 10⁰C drop in temperature doubles it.

Check the square meter area. Refer the technical data sheet for theoretical spreading rate (M²/Ltr.).
Theoretical Paint Consumption (Ltr.) = Total Area(sq. m)/Theoretical spread rate (sq.m/ltr)
Also include the loss factors like paint wastage due to handling, spillage, surface roughness, application technique, actual film thickness and painter’s skill.