Cleco the R/H wing spar extension, upper and lower stiffeners for the spar extension to the main spar. Drilled the six holes that need to be drilled to a number 12 hole. Taped off the spar extension, both upper and lower spar extension stiffeners, and the two stiffeners for the back side of the spar extension for priming. Priming the mating surfaces. Scuffed the areas for priming.