HG marble & natural stone impregnator penetrates deep into the surface and completely seals off small pores. Larger pores are made smaller meaning liquid molecules can no longer be absorbed. However, any dampness in the floor can still evaporate. It is suitable for inside and outside use. Apply HG marble impregnator evenly in one direction with a paint roller or a non fluffy cloth. Allow to penetrate for a maximum of 5 minutes. Then remove any surplus with a dry cloth. One litre is enough for a surface area of 10 to 20 m2.