Can I use green(lid) all purpose joint compound to skim a plaster wall?
I would patch cracks with general purpose , any large cracks use paper tape or mesh so it won’t crack in the same place after being painting. To give a really easy nice finish after the patch work is done is to use “topping mud”, it is much lighter than general purpose and way easy to sand. I used this method on “quick skim” jobs where I wanted to change the texture type, you can use general purpose for skim but it takes longer to dry and is a bit tougher to sand. (Topping mud is not hot mud it is lighter and softer than general purpose and not for cracks).