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n my opinion, it would be far better to omit the water/DNA wipe and sanding, and spray a 1 - 2# cut of dewaxed, classic alcohol based shellac as a sealer over the "cured" BLO. This is a time tested recipe for sealing BLO and providing adhesion of subsequent topcoats.
For what its worth, i've been told by Target (and read anecdotal reports) that not all their products do so well over shellac. That would be my normal schedule as well, but per Target's recommendation I used their brand of sealer on my last piece and it worked fine. Doesn't look quite as nice as shellac, though.
Melad StudioWorks
North Brookfield, MA