What is a common sign of inadequate adhesive curing?

Curing of adhesive is a critical aspect that determines the performance and reliability of adhesive anchors. A common sign of inadequate curing is the yellowing or soft texture of the adhesive, which indicates that the adhesive has not properly set or achieved its full strength. When an adhesive does not cure correctly, it may retain a tacky or soft feel, preventing it from providing the necessary bond strength to support loads. This inadequate curing can lead to failure of the anchor installation under stress.

In contrast, a shiny surface appearance might be typical for some adhesives but does not directly indicate curing issues. A strong, rigid texture after curing is generally a sign of successful curing, while a quick drying time can sometimes be a feature of certain adhesives but does not reflect their curing quality. Thus, the presence of yellowing or a soft texture in adhesive is a clear and recognizable sign that the adhesive did not cure adequately, which is why this option is the correct answer.