sorry jeff...i was wondering if it was feasible to hold off on priming until after the skins were match drilled and ribs were dimpled. i did a search on 'wing rib dimpling' and found that others have asked the same question, and the general consensus was to follow the plans. the clecos won't hold the ribs tight enough to make match drilling the skins precise enough.
i was just concerned about priming, then drilling holes to expose raw AL, but it will be filled with a rivet, so it won't make a difference.
that was it!