I live in Arizona at 4400' elevation. That means we get a touch of the 4 seasons here but the summers are hot.
So I tried the Retarder on a final coat of clear to see if it would flow out better.
This is the 3rd coat of clear as sprayed using the Retarder.
View attachment 23411
Personally, I haven't used it since. I find I can get the same results using the Slow Activator and Slow Reducer.
If you find your are getting too much orange peel in your clear coat applications, there can be a number of reasons for it. Experience and technique can eventually resolve this but for a quick fix the Retarder will definitely help.