CS-309-25 Can CS-309-25 be used on a garage floor? CS-309-25 is a solvent-based material. W. R. MEADOWS cannot recommend the use of a solvent-based material in this type of... Can the second coat of CS-309-25 be applied earlier than four hours? It is stated on the CS-309-25 datasheet to wait four hours until opening the area to foot traffic. When applying... Is CS-309-25 resistant to hydrochloric acid and magnesium sulfide? No, our sealers and cure-and-seals are not resistant to hydrochloric acid or magnesium sulfide.