Weld through primer will out gas and ruin any welds with mig or tig because the out gassing will interfere with the shielding gas. Weld through should only be used with resistance, aka spot-welding. Spot welders for automotive repairs are pricey so few hobbyist have them. An excellent alternative would be one of the panel adhesives for flanges that would normally be spot welded. The sail panel area will need to be butt welded and prepped on both the inside and outside before epoxy priming. Do not try to overlap and bond any outer body seams such as the sail area as a line will bleed back after paint. BMW does have a procedure to bond the sail area but they supply a specific filler to finish the seam with that is not available otherwise.
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