I wouldn't mix more than it takes to do a coat at a time or you'll find it setting up in your bucket. You want build (minimum 10 mils) which doesn't lend itself to appearance. The fish don't care what the bottom paint looks like and sanding ablative (if that's what you're using) is an oxymoron. If going with Baltoplate or VC-17 then yes, burnish the paint after you are done. Interprotect is an epoxy and does not sand well. That's not what it's designed for.
Baggett and Sons Marine Restoration
The Landing at Colony Wharf
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