yes. i sprayed the headlights already. it turned out good. no mineral spirits required.
the trick to spraying is to not move the can too fast, or else it will not turn out clear.
The spray method involves too much prep work. I'm beginning to think that the water based can of spar would work just as well. Just use a paint brush to slap on a thick coat, then sand the layer smooth.
As I said - I was not able to use spray :buffing:
and yes, it took me like a 30 min to tape newspapers around each headlight - isn't easy for angle lights
but, mix spar with minerals and apply it took me may be 5 - 10 min and I got way more control over what I do this way. While spray has to be faster, but not for me.