Marine Polytrol

Color restorer for dull or faded surfaces including gelcoats

from 26 reviews
Marine Polytrol 1L Gelcoat Restorer
  • Restores the color and appearance of dull and faded surfaces caused by exposure to sunlight, rain and pollution
  • Deep penetrating oil that restores the original look and finish to gelcoat, plastic, metal and other surfaces
  • Protects against corrosion and blemishes
  • On bare metals Marine Polytrol restores the shine and protects against corrosion
  • Suitable for use on fiberglass (GRP)

Marine Polytrol is a deep penetrating oil which restores the original color and appearance of dull or tarnished plastics, gelcoats, metals and other surfaces. It penetrates the surface, re-wetting the pigments to restore their luster and color which has been lost through exposure to sunlight, rain and pollution and it also gives corrosion protection.  When used on tarnished metals, it brings back the shine and gives long-term protection against corrosion.

Simple to apply using a cloth or soft brush, it’s ready to wipe off in just 10 minutes! It can be used on both horizontal and vertical surfaces and can even be used on fiberglass (GRP). Marine Polytrol dries to a tough and long-lasting flexible finish which does not leave a film – so it won’t peel or flake.

Ideal Uses for Marine Polytrol Gelcoat Restorer

  • Reviving the gelcoat on your boat
  • Restoring the shine to metal fixtures
  • Rejuvenating flat or chalky paint dulled by weathering
  • Brightening the surface of tiles in stone, terracota, marble, slate, etc.
  • Reviving the color of faded GRP surfaces


DO NOT use Marine Polytrol on white surfaces, it will not work as it is designed to restore pigments.

Surface Preparation

All surfaces must be clean, dry and free of dirt, grease, grime and mildew. All waxes, polishes, silicone etc. should be completely and thoroughly removed. Treat any mildew with a 50:50 bleach and water solution. Scrub the solution on to the surface and allow it to stand for 10-15 minutes then rinse thoroughly.

Using Marine Polytrol on plastic, gelcoat, tiles, painted surfaces etc.

Clean the surface with warm soapy water or Deck Cleaner, rinse thoroughly and allow it to dry for a minimum of 24 hours depending on the surface.

Using Marine Polytrol on stone, brick, etc.

Clean the surface with Deck Cleaner, rinse thoroughly and allow it to dry for a minimum of 24 hours depending on the surface.

Using Marine Polytrol on metal

Clean the surface with warm soapy water and rinse thoroughly or use an appropriate solvent (follow manufacturer’s instructions). Leave the surface to dry for a minimum of 24 hours.

Application of Marine Polytrol Color Restorer

General directions

Always work in areas that can be completed 10-20 minutes to ensure an even appearance. If the surface absorbs the Marine Polytrol unevenly (i.e. some matte and some shiny patches) move any surplus oil from shiny areas to matte areas. Wipe off any excess Marine Polytrol with a lint-free cloth before it becomes tacky. For a shinier finish, buff the surface with a lint-free polishing cloth.

Applying Marine Polytrol to plastic, gelcoat, tiles, painted surfaces etc.

Apply Marine Polytrol liberally and evenly with a brush or cloth. Allow it to work for 10-20 minutes. Wipe off any excess with a clean lint-free cloth. Leave it to dry.

Applying Marine Polytrol to stone, brick, etc.

Apply Marine Polytrol liberally and evenly with a brush or cloth and leave it to work for 10-20 minutes. Brush out or wipe off any excess Marine Polytrol with a clean lint-free cloth. Leave it to dry.

Applying Marine Polytrol to metal

Apply Marine Polytrol using fine wire wool (000 grade) soaked in Marine Polytrol and allow it to work for 10-20 minutes. Wipe off any excess Marine Polytrol with a clean lint-free cloth. Leave to dry.

Note: Marine Polytrol is not a surface coating. Its place is in the surface, not on top.


Maintenance is due when a Marine Polytrol treated surface shows signs of fading. Prepare and re-treat surfaces as directed above.

Clean Up

Clean any tools used with white spirit. Marine Polytrol is non-flammable, however, any rags, steel wool etc. soaked in Marine Polytrol may spontaneously catch fire if improperly discarded. Rags, steel wool etc must be saturated with water after use or placed in a sealed, water-filled metal container, before disposing of them with household waste. Rags may be laid flat and air-dried before discarding.

Things to Remember

  • Cover and protect everything you do not wish to treat.
  • Apply between +5°C and +35°C.
  • Do not apply in direct sunlight or on to hot surfaces.
  • Do not allow excess Marine Polytrol to dry and create a film on the surface (always remove excess product).
  • Do not use Marine Polytrol on white surfaces.

26 reviews for Marine Polytrol

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  1. Terry Verified Owner

    Totally restored the color of my fiberglass front and rear fifth wheel caps. The instructions say to use a cloth, that didn’t work well, so I switched to a foam applicator that worked superbly. It is very tacky. I used several microfiber towels to remove the residue. Definitely takes some elbow grease, but it totally works.

    Definitely recommend this product.

  2. Terry Verified Owner

    Very satisfied with the product used on my 23 yr old bass boat. One problem was streaking appearance. Color was fine but finish looked sketchy. Replication didn’t change sketching. Dried to hard surface. Would definitely recommend.

  3. John H Legan Verified Owner

    This product is awesome and I was very impressed with how my 92 Ranger bass boat turned out. It looks like a new boat and looks awesome. I have pictures and would like to put them in my review.

    • Abby

      Hi John
      Fabulous, thank you for the review! We have sent you an email
      The Owatrol Team

  4. Steve G

    I recently picked up a 1997 17′ Seda fiberglass kayak. Solid as a tank, it was once a beautifully-finished candy apple red. After 25 years, it’s now oxidized, faded, and reduced to a faded pink. My research landed me on the Owatrol website. After I started the restore, I contacted Abby Lucas with many questions. She worked diligently to get the answers I needed. Their Marine Strip removed the heavy oxidation and a large test area, leaving a clean, smooth surface across the entire boat. Then, the magic happened. Applying the Gel Restorer INSTANTLY brought the finish back to its brilliant red. It took less than half the quart to cover the boat, including the cockpit. Of all the products I researched, Owatrol’s is by far the most effective and easiest to use. The quality of the products, the incredible customer service, and most important.. the results blew my mind, figuratively . This is THE best product on the market for painted fiberglass restoration.

  5. dean Shoffner Verified Owner

    brought back the metal flake color on my 40 year old boat, I won’t have to re-gel coat or repaint it. Truly a cost saver and easy to use.

    • Abby

      Amazing, thanks for the review Dean 🙂
      Please feel free to send us pictures of your project, we love seeing before and after shots

  6. David A

    The Owatrol Gelcoat Restorer brought back the dark blue gelcoat on my 2006 Yamaha SX230. Its been over two months since we applied one treatment and it still looks new. Great product.

  7. Michael

    Love this product. I was not expecting this but I am so pleased with the results, was a little prep work on getting oxidation removed, but the results I am very pleased.

  8. Don Verified Owner

    I needed to restore the look of a fiberglass observatory dome. I tried cleaners, polishers, waxes, etc., but these did not work.
    So I tried this product (Marine Polytrol) and the dome (which is green) is back to an excellent-looking condition.

  9. A Customer

    This product does everything they say it does! After wet sanding, this brushed on and buffed out, completely changed the look of the boat! I wish I could add before/after pictures. I would buy again!

  10. A customer

    Fantastic. This is the best thing to use for your wood platform on your boat

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This coverage indication is only a guide and actual coverage is dependent on surface type, age, porosity etc.
Coverage: 18m2 (194 ft²) per liter
Tools: Soft brush or rag, fine wire wool for metal
Suitable for: Exterior & Interior use
Clean up: White Spirits
Drying Time: 10-20 mins (leave for 24 hours before use)
Restrictions: Marine Polytrol restores pigments so cannot be used on white surfaces
Suitable Surfaces: Plastics, gelcoats, GRP (fiberglass), metal, painted or varnished surfaces, stone, tiles, bricks, metals & more