Wetting is a term to describe what happens when a liquid comes into contact with a
solid surface. Good adhesive wetting, proper solidification (curing) of the adhesive, and
sufficient deformability of the cured adhesive are important (Baier et al. 1968). Adhesive
wettability is the ability of the adhesive to make intimate contact with a surface. Wettability is
measured by the contact angle of a drop of liquid on the surface. The contact angle and
wettability are related to the surface free energy. Wettability of the liquid-solid interfaces is
paramount to adhesion strength.