From my 8+ month experience with meznerna and 3+ years with most of the Meg's stuff, I'd say SIP is around 5.5, closer to 5 and 106ff is a 3, on that scale, compared to Meg's stuff
According to the chart at Autogeek SIP=IP in cut/gloss/abrasiveness, but SIP recommended for OEM and IP for repair/aged. Will someone explain what that means?