I wouldn't spray the bird with anything other than water. Even adding aloe to the water, which is done by many, does have risks. If it's not necessary, I don't think it's worth the risk.
New feathers can make him irritated. He would usually have a flock member to help him out with them. He may eat more while the feathers are coming in. The good news is that I think he is on the right schedule if his feathers are finishing growing in now (assuming you're in the temperate latitudes of the northern hemisphere.)