So I am fixing some rust spots. Back at the rear drivers corner. About 4x3 inches. The problem is there is also a crack in the seem from the rear quarter panel and the tail gate surround area. It has body fillet of some type in it. Should I simply fill the cracks and paint, leave it be, or what? As for the lower section, it's significantly lower at the metal than the above paint. Should I use some body filler to get it closer to flush then paint or hope it comes close.
Also any tips on blending would be appreciated.