Luis had been out sick for three days when he finally returned to finish the job. The client was glad that Luis was feeling better and eager to see the job finished. All that remained was touching up the wall near the trim. Luis had a steady hand and was sure the client would be excited with the final result.
However, after finishing all the corner-work and trim work, Luis started to notice that the paint appeared to be a different color than the rest of the wall. The difference was subtle and it was unlikely anyone, including the client, would ever notice. But Luis noticed, and it aggravated him. As he lay in bed ill for the previous three days, he had worried that this might happen. Some of the paint he applied today was actually going over the paint from earlier that had already dried. And that was causing a problem.