Sure UP is the SU (sulfonylurea) herbicides adjuvant. It is designed to condition the spray water to completely dissolve any sulfonyl urea or sulfonamide herbicides. This increases the surface area of the herbicide which increases the rate and the amount of herbicide uptake.
The key to increase the efficacy of sulfonylurea type chemistries is to increase the solubility of the herbicide and to provide the herbicide with the optimum surfactant(s). Sure UP is designed and engineered to do just that!