Marcus I have been using the Matrix Brand from House of Color for the last 6-7 years. I originally started with MS 52 with the MH005 hardner and their reducer. That was a 4 clear to 1 hardner then I added 2 parts reducer.
I now use MS 47 which has a higher solids content. It is 2 to 1. I then add 1 part reducer which I am using MH006 hardner which has a slower cure time.
I still polish these like any other paint.
I haven't had a self life issue but I do keep the paint in the house so it stays at around 75 degrees.