Controlling problem weeds just became easier with the introduction of the new Roundup ProDry herbicide. This concentrated, completely water-soluble formulation offers the same benefits of Roundup Pro herbicide plus: Roundup ProDry delivers rainfastness in an hour. Roundup ProDry is guaranteed rainfast in an hour. Simple and mistakeproof measuring saves time and labor cost. Dust-free formulation eases your mind with less spilling and splashing for improved worker protection. Easy, quick cleanup with less waste. Info from Monsanto