smooth fascia boards

I have a fascia board with peeling paint. the source of the moisture has been corrected. i scraped the boards and featherd out the chips. i applied the first coat of primer, but the divets are still visible. these divits in some cases are about three inches in diameter, and in other areas, they are about 2-4 inches wide by about 24" long.
everybody i have talked to has a different remedy, primarily paint store guys.
what is the correct way to handle this situation so that in the end, the fascia board ends up smooth?