Definitely sand carefully with 600/800 wet/dry; clean very well with soap/water; rinse; dry very well; and then re-spray with several light coats of a good clear coat. Apply the second and third coats within the listed re-coat time.
I would actually recommend a more durable clear such as SprayMax 2K. This is a 2-part clear with a built-in catalyst. It is easy to apply and extremely durable when fully dry. The problem is that once the catalyst is introduced to the clear, you must use it within 48 hours maximum (after that everything inside the can turns solid).
That said, SprayMax do make a good 1K (1-part) clear which is quite good and actually would be fine for bars, etc. It has no catalyst, so it can be stored/re-used indefinitely after the first use.
Both can be found in many auto paint stores.
SprayMax 1K Clear coat.
SprayMax 2K Clear coat.
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