For years we’ve demonstrated Fix All Turbo with two pieces of wood. Apply Turbo to one piece, press the second onto it and start the timer. You can see it in the official Turbo video:
The result looks like this.
After 20 minutes, we invite anyone to pull the pieces apart. There’s plenty to grip and room for two people to pull. Until recently, nobody had managed it.
Then someone did.
Look closely: the wood snapped. The Fix All Turbo bond held.
Three ways a bond can fail
Adhesive failure is when the bond breaks at the surface, between adhesive and substrate.
Cohesive failure is when the adhesive (or sealant) itself tears apart.
Structural failure is when the substrate breaks.
This was structural failure. After 20 minutes, the adhesive and cohesive strength of Fix All Turbo was higher than the strength of the wood.