
The outermost layer of a fiberglass boat is usually coated with a special resin called gelcoat, which protects the hull and gives it its colour and
How to shine a dull fiberglass boat
| Characteristics | Values |
|---|---|
| Cleaning | Use a dedicated boat cleaner, without removing the wax from the fiberglass |
| Cleaning products | Fiberglass Powder Cleaner, detergent, bleach, fiberglass cleaner |
| Waxing | Use a damp cloth to apply wax in a circular motion, then wipe off with a dry cloth |
| Polishing | Use an abrasive to smooth out the coat, apply by hand or with an electric buffer |
| Gelcoat | The outermost layer of a fiberglass boat, which protects the hull and gives it colour and shine |
| Gelcoat condition | May need stronger abrasives if the gelcoat is badly weathered |
| Waxing benefits | Prolongs the glossy look of a boat, provides long-term protection, preserves resale value |
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What You'll Learn

Clean the fiberglass with a dedicated boat cleaner
To clean fiberglass with a dedicated boat cleaner, start by rinsing your boat with water to remove any loose debris and dust. Then, fill a bucket with water and add a boat cleaning soap, mixing it well. Use a long-handled soft brush or sponge to scrub the exterior of your boat. If your boat has mildew, add some bleach to the detergent solution. For tough stains like fish blood or waterline scum, use a dedicated boat cleaner like Starbrite Non-Skid Deck Cleaner or a degreaser like Purple Power or Zep Orange Degreaser. If your fiberglass floor has stains, try using a small amount of dishwasher soap and scrubbing with a brush.
After cleaning, rinse your boat again and allow it to dry completely before moving on to the next step. If your fiberglass is only in need of a thorough cleaning, this may be enough to restore its shine. If not, you can try using a fiberglass powder cleaner or a polish to restore the shine and smooth out the coat. If the gel coat is truly degraded, you may need to reapply it.
If you want to add a protective coating and enhance the gloss of your fiberglass boat, you can apply wax. Use a damp cloth to apply the wax in a circular motion, ensuring an even layer. Wait for the wax to dry and get a hazy appearance, then wipe away the excess residue with a soft cloth. Buffing the surface will enhance the shine. Regular waxing can help maintain the gloss of your boat's gel coat.
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Wax the fiberglass
Waxing your fiberglass boat is a great way to make it shine and look like new. It is also essential to maintaining the colour, shine, and integrity of your boat's finish. It is a process that requires going over the entire surface of your boat's exterior multiple times. Here is a detailed, step-by-step guide on how to wax your fiberglass boat:
Prepare the Boat's Surface:
Firstly, park your boat on a flat surface, securing it to a trailer to prevent any unexpected movement. Spray the boat down with water to pre-rinse and loosen up debris. Then, use a quality, non-abrasive boat cleaner to scrub the boat thoroughly with a boat brush, covering a large area quickly. Rinse and dry the boat completely. It is important to ensure that the boat is out of the water and completely dry before applying the wax.
Choose the Right Wax:
There are different types of waxes available, each serving a specific purpose:
- Cleaner Wax: This wax provides a gentle scrub that removes stains, dirt, and surface damage.
- Boat Polishing Wax: This wax is synthetic and designed to block damage from saltwater, UV rays, and more, without losing its integrity.
- Restorer Wax: This wax is recommended for old or severely damaged boats as it contains coarse compounds to remove deep markings.
Apply the Wax:
Apply the wax with a soft cloth or sponge in even, circular motions. Ensure you cover a maximum area of 4' x 4' and wipe off immediately with a clean, dry cloth. The wax will fill the nooks and crannies of the fiberglass gel coat, providing a smooth finish. Allow the wax to dry completely.
Buff the Surface:
Once the wax is dry, use a soft towel or microfiber cloth to buff the surface in circular motions. This will remove the wax and enhance the shine. You can do this by hand or use an electric buffer for quicker and smoother results.
Waxing your fiberglass boat is a straightforward process but requires time and dedication. By following these steps, you will be able to restore the shine and protect your boat's finish.
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Polish the fiberglass
To restore the shine to your fiberglass boat, you need to polish the gel coat—the outermost layer of your boat's hull that provides colour and shine. Polishing is an abrasive process that smooths out the coat and removes the pitted surface.
Before you begin polishing, it's important to clean the surface thoroughly. Use a dedicated boat cleaner or a detergent solution (a cup of detergent with a gallon of warm water) and a sponge to wash the hull. If there are difficult stains, such as mildew, fish blood, or waterline scum, add some bleach to the detergent solution or use a concentrated cleaner formulated for fiberglass. Rinse the surface and allow it to dry.
Once the surface is clean and dry, you can start the polishing process. Apply a strip of polishing compound onto the surface of the hull. You can use a product like PolyShine, applying it by hand or with an electric buffer. Work in a maximum area of 4' x 4' at a time. If the gel coat is heavily oxidized and pitted, you may need to use a stronger abrasive rubbing compound specifically formulated for fiberglass. Rub the compound with a circular motion until the surface turns glassy. Be careful not to rub in one place for too long, and stop if the gel coat starts to look transparent.
After compounding, proceed with polishing. Polishing will remove the chalky discoloration and leave the surface of the gel coat mirror-flat. Finally, apply a coat of wax to protect the shine and make your fiberglass boat look new again.
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Use a fiberglass rubbing compound
If your fiberglass boat has lost its shine, it's probably because the outermost layer of the boat's hull, called the gel coat, has become weathered. This is a common occurrence due to the gel coat's soft surface, which can be eroded by exposure to the elements, leaving it dull and chalky. But don't worry—you can restore its shine by using a fiberglass rubbing compound. Here's how:
First, start with a thorough cleaning. Use a dedicated boat cleaner or a fiberglass powder cleaner to clean the surface of your boat. Rinse and allow it to dry. This step is important because it might restore the shine without needing to move on to more intensive methods.
If the cleaning doesn't bring back the shine, you can try waxing. Waxing your boat will provide long-term protection and can even restore the shine if the gel coat isn't too badly weathered. Apply the wax with a damp cloth, using a circular motion, and make sure to cover an even layer. Wipe off the wax with a clean, dry cloth immediately after application.
If waxing doesn't do the trick, it's time to break out the fiberglass rubbing compound. Make sure to select a compound formulated specifically for fiberglass. Apply the compound to the surface of your boat, just like you would with polish, using a circular motion until the surface turns glassy. Be careful not to rub in one place for too long, as you don't want the compound to cut through the gel coat. If the gel coat starts to look transparent, stop the application.
After using the rubbing compound, you'll want to polish the surface. Polishing will smooth out the coat and restore its luster. You can apply a product like PolyShine by hand or with an electric buffer, depending on the size of your boat. Finally, apply a coat of wax to protect the surface and improve the gloss. This final step will help ensure that your fiberglass boat shines like new!
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Remove wax with dewax solvent
To make a fibreglass boat shine, it is important to start with a thorough cleaning. If that doesn't work, you may need to wax your boat. However, if you are planning to apply a new coat of paint or wax, you must first remove the old wax without damaging the fibreglass.
To remove wax from a fibreglass boat, you will need a dewax solvent. A good product to use is TotalBoat Dewaxer and Surface Prep Solvent Wash, which removes wax, dirt, grease, oil, and other contaminants from fibreglass, gel coat, stainless steel, wood, aluminium, and bronze surfaces. It is important to use a product that is specifically designed to remove wax without damaging the fibreglass underneath.
Once you have your chosen dewax solvent, follow these steps:
- Ensure your boat is clean and dry. Bring the boat out of the water and give it time to dry off. If your boat is already on dry land, ensure it is in a protected, well-ventilated area.
- Apply the dewax solvent with a clean, dry, lint-free cotton rag or towel. Do not use an abrasive material that will scratch the fibreglass.
- Wipe the solvent in a circular motion to remove the wax.
- After removing the wax, you can apply a fresh coat of wax or move on to painting.
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Frequently asked questions
The first step is to give your boat a thorough cleaning. Use a dedicated boat cleaner or a solution of detergent and warm water, and don't forget to protect your hands with rubber gloves. If this doesn't restore the shine, you can try waxing or polishing your boat.
Use a wax formulated for boats, such as LifeWax or a wax-sealer. Spread the wax evenly with a damp cloth or an electric buffer. Wait for it to dry and get cloudy, then buff the surface.
Polishing is an abrasive process that removes the topmost surface of the gel coat. You can apply an abrasive compound by hand or with an electric buffer. If the gel coat is badly degraded, you may need a stronger compound.























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