Gentoo is an excellent anti-corrosion coating. Gentoo’s dense structure provides a high physical barrier to electrolytes that cause corrosion and an insulating electronic barrier for galvanic corrosion. For best results, a paint or another protective coating should be applied to the substrate, and then Gentoo should be applied when the paint or other coating is still “green” (tack-free but still has reactive groups available to help to bond). Gentoo hydrophobic coating can also be applied to a paint or other coating after it has dried, but surface roughening (if acceptable) is recommended to promote adhesion. Gentoo can also be applied directly to a substrate. In this case, surface roughening (if acceptable) and/or other surface preparation methods are recommended to promote adhesion.