Question 1: Can I wet sand the base paint before I put clear on it
for a smoother finish?

Answer: There should be no need to wet flat base coat before
applying the clear coat. If there is an issue with the base coat,
wet flat with 1200-grit wet and dry flatting paper, then re-apply a
further 2 coats of base. Try to ensure a smooth and even
application before applying the clear coat.

Question 2: How long after I spray clear can I wet sand it?

Answer: Clear coat can be wet flatted around 24 to 48 hours after
the application.