should go onto the Interprotect before it cures completely, achieving a chemical bond, rather than a mechanical one. In fact, the box I have in hand says to apply the first coat of bottom paint fairly quickly. The example times on the box show last coat of Interprotect at 1100, first coat of antifouling at 1600.

That would seem to negate sanding with 80 grit.

What am I missing here?