Bottom paint removal?

[CHANCE1234]

Tried a different pressure washer, 3300 psi alone with no sand. Just water and it took 75% off fairly easy. Did the majority of the starboard side in about an hour. In the last pic below you can see where the fiberglass is exposed. I don't know if it's from the washer or 40 years of use and abuse. I bet another 25 lbs of walnut shell would get almost the rest of the paint off that side.