It's now better than six weeks later, and we've had some blistering heat over the summer. As a result of the aging process, the visors look better now than when I first did this. No peeling, no cracking, no blemishes at all. About the only effect is that some of the residual shine has softened up a bit as they have aged, making them an even closer match to the surrounding plastic parts which have similarly aged.
If I had to do it all over again - I would have done it sooner the first time!