From Proper Auto Care's Klasse Interview.
I've never used SG, but I can't imagine the difference between 2 and 2+ is that great. But, like I've said, I've never used it. For most products, 2 coats is enough for me. My car is a daily driver. If I had a show car, I might dedicate more time for lots of coats.
Q. Should you wait between applying multiple coats of HGSG?
A. The first coat of HGSG can be applied immediately over a base coat of All-In-One. After that, it's best to wait 8 to 12 hours between coats of HGSG. We have customers with show cars (not daily drivers) that will wipe on a coat of HGSG one day, buff it off the next day and immediately apply another coat. They'll do this every day for a month, literally putting on 30 coats of HGSG over a 30 day period. This sounds crazy but I've seen some of these cars and they're absolutely breathtaking!
I've never used SG, but I can't imagine the difference between 2 and 2+ is that great. But, like I've said, I've never used it. For most products, 2 coats is enough for me. My car is a daily driver. If I had a show car, I might dedicate more time for lots of coats.