Specifically something like a hood or roof. The roof on my car has been painted with spray cans and has some patchiness to it. My friend says using a catalyzed 2K clear like Spray Max 2K glamor clear will make it uniformly glossy. Another friend used it on the dash of his '50 Chevy and it looks good but I'm concerned how well it will work on a large flat panel and if I’ll just end up with a shiny patch mess? Will it make a worthwhile improvement?
I've used it on a couple of things and it's OK but I wouldn't expect it to solve a lot of problems. Being a two-part probably means it will hold up longer than a regular rattle can clear. But it is still a rattle can and that means that the film thickness is really thin compared to regular automotive paint from a gun. Any imperfections in the surface will be visible in the glossy finish. You would need to put on a number of coats to get enough film build to be able to go back and wet sand and buff it.
In reply to Kubotai :
Thanks, that's kinda what I was thinking.
The problem most people experience with rattle cans is not overlapping by half on the "wet coat" and the patchiness is caused by over spray sitting on top of the already drying paint. Try to spray it one more time, doing a light mist and then overlapping long wet passes so the new pass combines with the previous if that makes sense
In reply to Justjim75 :
Where was this information most of my life ago? 
In reply to Justjim75 :
The Spray Max cans have a good nozzle that gives a fan pattern which makes the 50% overlap that you mention fairly easy to do. A lot of the other rattle cans have nozzles that give you a concentrated dot pattern that makes overlap pretty tough.
In reply to Kubotai :
Agreed
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