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You may have, or have had, several issues here. I have done this on numerous cars. Your first issue was the grits you used. People sand headlights because the clear coat on the headlights is failing - either from many tiny stone pits, or or more often because the sun has degraded it, causing it to either clouded up or shrink, causing lots of "crazing." So the clear coat needs to be removed. 800 grit is not nearly coarse enough to do that. You need to start with no finer than 400, but I use 320. How fine you go depends on what your top coat will be. If you are spraying on an auto paint clear, then 600 is fine enough. But if using some specialty top coats for headlights, or PPF, then you need to polish like you did. I can do a headlight in an hour. I use 320, 400, 600, 800, 1200, 1500, 2000, 2500 and 3000. I just have a piece of each in a bucket of clean water. You skipped too many grits and did not sand enough because of that. It left too many scratches from prior grits, and probably some is crazing because you have not fully remove the damaged clear coat.
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