Riveted the W-1203-R Outbd Wing Skin. Prepped the W-1202-R Mid Wing Skin by deburring the edges and priming the inside with Mar-Hyde. It was a very hot day today and I primed under direct sunlight. It seemed that, probably because of the heat, the primer was drying quickly before sticking to the skin. I'll remember to avoid priming under this condition next time. I was able to rivet the bottom of the Mid Wing Skin today. The bottom of the right wing is pretty much done. A very productive day!