My boys used sand blasting for my baghira.
But they blasted sand in three or more steps. So it's not that difficult for the ship.
After that, the Baghira has some very small holes. But this holes also has a different owner when he removed the old layers of paint with a random orbital sander.
This is not from blasting, but from air or water inclusions in the old painting and the beginning of osmosis.
So he and my boys smooth the ships with an epoxy spatula. Then 7 layers of an epoxy paint and then the antifouling.
Now, it looks very good.
SV Baghira, Sharki #42