The Oklahoma Department of Transportation (ODOT) has recently completed a field performance evaluation of Dow-Corning' s (DC) self- levelling sealants 888-SL and 890-SL. The evaluation was conducted on three new construction projects, where joints were sealed with the evaluated sealants shortly after construction. Also included in the evaluation were two sites where failed sealant was replaced. Two of the new construction projects were constructed in phases, with one expressway completed approximately one year before the other. On these two projects, the expressways completed first used an accepted non-self-levelling sealant. The second expressway completed was sealed with the evaluated products. A direct comparison with the accepted sealant could not done due to differing traffic conditions.However, a rough comparison of the number of failures in similar sections on both roadways was done. Both experimental sealants performed well and a conclusion that both should be accepted was made at the completion of the study.