Stoichiometry

The geometry of the baffles inside does the blending, and it only works if the two streams arrive in the right ratio and get folded into each other enough times.

It's doing stoichiometric blending in real time, in a nozzle that costs about a dollar.

Stoichiometric being the word that decides whether your repair holds.

Completely.

The rule of thumb is one-to-one by reactive groups, and the CKN Composites knowledge base puts a blunt number on it that cured properties very dramatically with only a few percent deviation from the exact stoichiometric amount.