I had the bottom of my hull soda blasted in 2001 out of Jackson marine in Fort Lauderdale. They charged me $600 just for the bottom of the boat. It had several coats of bottom paint on it. I repainted and regelcoated the boat. The out side (water line up) was white painted and I sanded all that off to the gel coat and then painted it blue. I re gel coated the bottom. I guess you could soda blast the whole boat but you could get pitting like I did on the bottom of my boat that had to be repaired before I could go forward. Usually soda blasting is just for bottom paint. Here are some pictures.
Before
Middle
After
FellowShip
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Just for the Grins