Old glass man here,
Never need anything but resin vapors to spin my ceiling. It's needed after grinding out the soft stuff for a repair and itching for a week.
The word "tooth" was used earlier. In the coating world it would be referred to as "profile". Yes 150 grit would be best to start with for either spraying or putting on thickened with a squeegee.
I think that's my 2 cents after sniffing resin for a few years.