We used Ballistic Black a year ago. Quite impressed.
Asked for advice from SML due to the several different blacking that have been used over the years. They said that after pressure washing to give 2 1/2 coats of Vinyguard primer followed by 2 full coats of Ballistic Black with a further coat around the waterline. So it does mean a full 7 days out of the water.
A year on, there are patches on the waterline rubbing steaks where the black has gone but the silver primer is still there.
The blacking is very thick to apply and it is easy to see at those places where the hull has been scraped that it sort of spreads the blacking along rather than scraping it off.