Sealants and caulks are used in construction situations where they are subjected to sizable deformations relative to the stress required for flow while curing and after curing. This study was designed to examine the elastic and viscous nature of specially prepared materials having built‐in variations in time‐dependent structure development. Few measurements have been made to characterize the elastic nature of the structure developed by such materials and to relate these to performance properties. When strains which exceed the elastic limit are developed, these systems can form brittle fractures. Above the elastic limit, the viscous properties of the material become dominant which should reduce the tendency to fracture. Tests were performed with the Rheometrics Mechanical Spectrometer and the Carri‐Med Controlled Stress Rheometer. The viscoelastic components(G′,G″,η*)and steady shear transient tests were obtained with the Mechanical Spectrometer. Since the Stress Rheometer induces a stress and measures a strain, a greater sensitivity is produced making the instrument ideal for yield stress determinations. Low shear rate creep tests were also made using the Controlled Stress Rheometer. Results show that these sealants behave as soft elastic materials which recover their structure rapidly when the yield value is exceeded.