The reaction is called ionic polymerization. Any surface capable of absorbing moisture is a good surface for bonding. Instantbond TM cyanoacrylates require sufficient atmospheric moisture to cure or catalyze the liquid adhesive. The Instantbond TM formulations cure best when surface pH is slightly alkaline or over 7.0. These surface conditions should be viewed as limitations for the Instantbond TM cyanoacrylate types.
Adhesive viscosity plays a vital role in the fixture time of cyanoacrylates.
The lower the viscosity, the quicker the adhesive will fixture. The higher the viscosity, the slower the bonding action. Gels do not flow like liquids and can be easily used on vertical or overhead surfaces without migration. Gap fill ability is directly related to the viscosity of the adhesive. Low viscosity adhesives have small gap filling capabilities.