paint

Either it wasn't mixed correctly, or the reducer and product weren't compatable..
Yes! You can sand that smooth and it will shine like the sun.
Start with a 600 grit (might need to hit it lightly with 400 first) then work your way up to 1200 then 1500. Most polishes will take out 1500 grit scratches. I went to 2000 grit. Once it is smooth and flat, hit it with the polisher and you'll be good to go.
It will just take longer is all. No problem though.

Good Luck.

George