A quote from and old HAMB post on this subject, From body school in the 60s. Grounding the chassis will help reduce the amount of overspray by minimising the static charges that build up in the paint and the body. Airflow through the hose makes a static charge that is transfered to the body via the paint spray. Subsequent coats are repeled by the static charge induced by the previous coat causing increased overspray as lighter particles do not go the the surface. When spraying lacqueres the reduced overspray was very evident as was the reduced dusting on the painted surface. It also seemed to polish out quicker. On Enamels the reduction was noticable, but the main thing was orange peel just didn't happen. My experience. We did some applied static painting. Practically 0 overspray but it also attracted dust, dandruff, hair, thread from clothes, bugs and small animals. As to all of that thoroughness Texas57. It seems like we are always finding things we missed even though we thought we had fixed everything earlier. Art some point you just have to say it's not a Riddler contender and move on..... Yes, those soft sanders have been very useful! Well worth the expense.