Compositions comprising a liquid and fumed silica may be applied to surfaces as a sealant, e.g., to protect against damage or deterioration. The composition may be a powder, wherein a method of treating the surface includes applying pressure to the powder on the surface with an applicator, and the pressure releases the liquid sealant from the powder onto the surface. The liquid may comprise water and one or more polymers, such as a fluorocopolymer and a functionalized anionic polymer.