POI-1QBRust is a car or truck owner’s worst enemy — or at least part of the automotive Legion of Doom.

Fortunately, POR-15 has come to the rescue with a corrosion-fighting line of rust preventive paints. While typical paints are weakened by moisture, POR-15 uses a unique formula of polymeric isocyanate derivatives that are strengthened when exposed to moisture. This allows the POR-15 to develop a long-lasting, non-porous, chip- and crack-resistant coating that keeps moisture and chemicals out.

But wait, students — there’s more science involved.

The dense, cross-linked molecular structure of POR-15 also allows it to bond chemically to rusted metal by penetrating the surface. POR-15 calls this “polydigital adhesion,” and you can see how it works in the photo below. This allows POR-15 to not only cover up rust and prevent it from spreading, but also strengthen the underlying metal and seal holes by forming its own membranes.


The photo on the left shows the finger-like characteristics of POR-15. These fingers penetrate the surface and create a bond with the metal. POR-15 calls this polydigital adhesion. The photo on the right shows how typical rust-preventive paints simply lay on the surface and do not create an actual bond with the substrate.

POR-15 coating options include:

  • POR-15 Black: ideal for frames, floorboards, trunks, and engine compartments
  • POR-15 Silver: contains metal filler and should be used on badly rusted steel to fill small holes
  • POR-15 Clear: for touch-up on exteriors surfaces before painting

You don’t need a chemistry degree to properly apply POR-15 rust preventive coatings. Unlike dual-stage coatings, POR-15 requires no catalyst. It’s typically applied with a roller and can even be top-coated by using the proper primer.

POR-15 has created a 3-step application process using:

Watch the video below for an overview of the application process. You can also look at some of the test results conducted on the coatings here.

Author: David Fuller

David Fuller is OnAllCylinders' managing editor. During his 20-year career in the auto industry, he has covered a variety of races, shows, and industry events and has authored articles for multiple magazines. He has also partnered with mainstream and trade publications on a wide range of editorial projects. In 2012, he helped establish OnAllCylinders, where he enjoys covering all facets of hot rodding and racing.