Spee couldn't have been spi/southern polyurethanes, not for that kind of money.
https://www.southernpolyurethanes.com/ I've been using SPI cleaners, reducers, epoxy and 2k surfacer for awhile now and am pretty happy with performance and value.
Will most likely use one of their clears as well once I get to that point.
For some smaller things (sprayouts, and a recent engine) I have been experimenting with FC720
(that is the one posted earlier from Amazon
https://www.amazon.com/Ultimate-Overall-Clearcoat-Hardener-HARDENER/dp/B01MR96I32?th=1 )
This seems like a very user friendly product to me and a good value.
I'm thinking it might be an ideal clear for jambs, trunk and engine bay but will probably use the more expensive spi for the exterior of my current project.
On my last one I tried to try try to use products from one manufacturer, which at the time was Matrix, but am not going to do that any longer.
Modern epoxy, 2k surfacer, urethane basecoat, urethane clear don't really seem to vary much and that's all I will use.
I've done all my prep with spi products, will be using PPG basecoat and will choose a clearcoat.
The last one I used Matrix MS52 clear, it was stored outdoors for many years and held up amazingly well, may go that way again but have the itch to
try something different and a little easier to polish.