Re: soda blasting?
I did my bottom with the hydroblasting (sand)and rented the equipment at a local Ct. tool rental place. All it is is a pressure washer with a sandblasting attachment.
The work goes quick, I just did it in the driveway and swept it up when it dried.
The sand is a little agressive, which was good for my bottom because it had HEAVY buildup. It also exposed a lot of blisters/ weak gelcoat. I used the Interprotect fairing and barrier coat system then bottom painted.
For your purposes, I think the soda would be better but you may have to look around for the soda. It leaves a nice eggshell finish which should be a good base.
Bill
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