Soil-Loc SOIL SHIELD 5 GAL 5 gal SoilShield-LS Stabilizer. SoilShield-LS is a soil stabilizing agent that is not just a surface treatment, it is a three dimensional form of soil stabilization penetrating the surface and forming a dimensional block. When applied it locks soil and decomposed granite particles to effectively resist erosion. SoilShield-LS is colorless when dry, therefore maintains a natural and aesthetically pleasing appearance.