The presence of a tacky or gummy surface on cured resin indicates incomplete hardening. This issue arises when the chemical reaction responsible for transforming the liquid resin into a solid polymer is disrupted or prevented from fully completing. A common manifestation is a surface that remains pliable and adhesive to the touch, rather than exhibiting the expected rigid, non-sticky characteristic of properly cured resin.
Achieving a complete and uniform cure is paramount for realizing the desired physical properties of the resin, including strength, durability, and resistance to degradation. The presence of uncured resin can compromise structural integrity, lead to aesthetic issues, and potentially pose health concerns due to the presence of unreacted chemicals. Historically, this problem has been a persistent challenge in resin applications, driving the development of improved formulations and curing techniques.