Sorry for double post, I first put on Remodeling by mistake:

I notice, again, that the label instructions for a latex satin enamel, interior, Krylon, calls for a wait time of 6 hours, but not more than 24 hours for applying a second coat.

I suppose this may mean that after 6 hours the coat is hard enough to hold the wetness of a second coat, but soft enough to not require roughing up/sanding. Does that make sense?

I suppose if 24 or more hours, then one should do a light sanding before applying a second coat. I do not think 24 hours accomplishing "curing", but suppose it is possible that that amount of time (on average) sets the surface enough to raise the adhesion problem if not sanded lightly first.

Help appreciated.