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==== Corrosion Protection ====
Organic coatings are a common way to protect a metallic substrate from [[corrosion]]. Up until ~1950 it was thought that coatings act as a physical barrier which disallows moisture and oxygen to contact the metallic substrate and form a corrosion cell. This cannot be the case because the [[Permeation|permeability]] of paint films is very high. It has since been discovered that corrosion protection of steel depends greatly upon the adhesion of an noncorrosive coating when in the presence of water. With low adhesion, osmotic cells form underneath the coating with high enough pressures to form blisters, which expose more unprotected steel. Additional non-osmotic mechanisms have also been proposed. In either case, sufficient adhesion to resist displacement forces is required for corrosion protection.<ref name=CoatingsBook>{{cite book| author = Z.W. Wicks; Frank N. Jones; S Peter Pappas; Douglas A. Wicks | title = Organic Coatings Science and Technology | edition = 2nd expanded | ___location = New Jersey | publisher = [[John Wiley & Sons, Inc.]] }}{{page needed|date=June 2013}}</ref>
=== Guide Wires ===
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