POR15 Whitecote

Posted: 14th December 2010 by asteriskr in Rallye 16v
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This is reference material for my intended use of POR-15 as the final finish in the engine bay:

Product Description
Whitecote Paint is a high-gloss extreme durability topcoat that can be applied over a number of surfaces, including heavy-duty vehicle chassis and trailers, floor pans, agricultural machinery, and many marine applications as well, including motors, heat exchangers, pumps, masts, decks, and hand rails. Whitecote coatings can also be used to protect equipment from strong acids, alkali, and other aggressive materials.

It can be applied over existing single and two-component primers as well as in a complete POR-15 paint application which would include POR-15 Rust Preventive Paint as a primer and POR-15 Self-Etching Primer as an intermediary coat. Whitecote coatings will not leave brush marks and will dry in less than an hour but will take 3 or 4 days to fully cure. Like many other POR- 15 coatings, Whitecote is a moisture-cured coating, which means it is strengthened by exposure to moisture.

Product Composition
Whitecote consists of two items:

  1. A blue paint can, labeled Whitecote, which contains the basic resin formulation.
  2. A smaller light blue can, labeled Hardener/Activator.

Warning: Your can of Hardener/Activator is sealed tightly. Remove the lid carefully and cover with a paper towel while prying off inner seal to avoid accidental spillage or splash. Your Hardener/Activator is very sensitive to moisture and humidity, so open it in a dry area. Keep both hardener and resin tightly capped when not in use. This is very important for maximum shelf life.

Mix 1 part Hardener/Activator with 4 parts Whitecote in a separate, re-sealable container. A clean glass jar works well as does a clean paint can with lid. Stir the combined contents thoroughly. When the coating is thoroughly mixed, thin as required.

You may mix partial quantities of Whitecote for small jobs, and you may use any measuring device you happen to have around (coffee scoop, measuring spoons, cups etc.). All you have to do is follow this formula:

Mix 1 part Hardener/Activator with 4 parts  Whitecote.

Whitecote Paint has a long pot life, up to 8 hours, if the lid is kept on the mixed batch when it is not in use.

Use as Part of a Complete POR-15 Paint System
Apply two coats of POR15 Rust Preventive Paint over a sandblasted surface or a surface prepared with Marine Clean and Metal Ready. Then apply one light to medium coat of POR15 Self-Etching Primer as soon as POR-15 Rust Preventive Paint has cured to ensure maximum adhesion. Allow POR15 Self-Etching Primer to cure for 30 Minutes at 68°F (20°C), or longer in cooler temperatures. Apply Whitecote as final finish. If surface has any irregularities that you wish to remove, apply a medium coat of TieCoat Primer over the cured POR15 Self Etching Primer. Allow this to cure for 2 to 3 days, then sand smooth and finish with 300 grit. Wipe down with dry tack cloth and apply Whitecote.


Apply a minimum of 2 medium coats for general automotive use, and a minimum of 3 full coats for heavy marine and industrial use. Whitecote may be applied by brush, spray, or roller. You can use any type of brush you prefer; Whitecote will flow out immediately, eliminating brush marks.

  • Lay down a medium covering coat, but be careful to avoid runs. A second coat may be applied when dry to the touch, usually 15 – 20 minutes later, though the second coat may be left up to 2 days before re-coating without sanding. Best method: recoat at 2–3 hourly intervals.
  • In temperatures below 64°F (18°C), drying times will be extended and consequently runs may be more likely. To minimize this in colder temperatures, small items can be warmed with a heat gun, or air temperature raised for larger items. Do not overheat items above 75°F (24°C).
  • Thin only with Xylene, if thinning is needed. POR15 Solvent or lacquer thinner may be used for cleanup. Whitecote may be thinned up to 25%, though you will need more coats to retain dry film thickness.

When applying a second or third coat by brush, surface tension may increase between coats. To reduce this tension, add some solvent to the mix so the coating will drop and flow out properly. For best results, apply at 68–75°F (18-24°C) with less than 70% humidity.

Whitecote will not perform as specified until it has cured for a minimum of 4 days at an average temperature of no less than 68°F(18°C). For example: Do not put engine parts into service before the 4 day cure time. Elevated temperatures will not speed up cure, so do not oven bake parts.

  1. POR 15 says:

    POR 15 is ideal in places where rust is highly prevalent and vehicles are susceptible to rust. This product allows you paint over rusted parts with high performance.

  2. I am greatful to say thanks to article owner. really valid information i got from this blog. Thank you, Garrett.