I know I can put on AIO+SG, one right after the other but, do I have to wait 24 hrs to add the S100 or is the 24 hours only if you plan on adding another layer of SG?
If you are using a paste topper like S100, you're probably ok. It's not ideal, as many suggest that it takes at least 12 hours or more for the SG to completely "harden". But paste waxes won't have as many solvents as liquid waxes, which may weaken the SG layer.