FLEX KWIK is a wonderful instant bonding adhesive for industrial purpoy, they have clamed it can "Also bonds -plastic, metal, rubber, wood, leather, and ceramic" I will rate it based on the bonding using this adhesive mainly used in our home that is, day-to-day using products
Plastic : 90%
Rubber : 80% ( but not shoes)
Wood : 70%
Leather : 50% ( but dont use in shoes or belt)
Ceramic : 40%
I have tried this in my shoes and it even get worse, it have bond intially but it just distroy the whole part where I applied, a white layer and so many cracks have been formed