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Owning a boat can be a lot of fun, but it also requires a lot of maintenance. One of the most important aspects of boat care is keeping the hull clean and free of stains. Over time, boats can become stained due to a variety of factors, including mineral deposits, organic matter, and oxidation. While some stains can be removed with simple soap and water, others may require specialised cleaning products and techniques. In this discussion, we will explore the different methods and products available for removing stains from a fiberglass boat, ensuring that your vessel looks its best and maintains its resale value.
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What You'll Learn
Removing organic stains
Organic stains on a fibreglass boat are caused by discolouration from bird droppings, aquatic plant or animal secretions, and spilled food and drinks. To remove organic stains, you can use a specialised organic stain remover, or try the following methods:
Firstly, it is important to protect yourself by wearing gloves, safety goggles, and skin protection. Before you begin, move the boat away from the water to avoid polluting it. Next, use a pressure washer or scrub brush to remove any soft growth, such as algae, or slime. Apply a specialised hull cleaner, like Starbrite Hull Cleaner, or a mixture of oxalic acid and water, to the hull. You can also try Bar Keepers Friend, by making a paste and applying it to the stains, leaving it for a few minutes, scrubbing, and then rinsing.
If the stains are particularly stubborn, you may need to use a heavy-duty compound, like Marykate On/Off, which contains muriatic acid (hydrochloric acid). Be very careful when using this product, as it can damage metal surfaces and cause irritation. Always follow the instructions on the product and take the necessary precautions.
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Using acid-based products
When removing stains from a fiberglass boat, it is important to keep in mind that there are two main types of stains: mineral and organic. Mineral stains include things like calcium, limescale, and rust, while organic stains are caused by bird droppings, aquatic plant or animal secretions, and spilled food and drinks.
If you're looking to use an acid-based product to remove stains from your fiberglass boat, there are a few options to consider. One popular option is to use a hull cleaner, which often contains oxalic acid as the active ingredient. These products are effective at removing stains but should be used with caution as they can damage the delicate gel coat surface of your boat if not used properly. It is also important to keep in mind that these products will react with metals on your boat or trailer, so it is crucial to take the necessary precautions to avoid contact with these surfaces.
Another option for an acid-based product is to use a product containing muriatic acid (hydrochloric acid). This type of acid is commonly used to clean fiberglass pools, hot tubs, and bathtubs without causing any harm to the surfaces. However, similar to other acid-based products, it is important to rinse it off quickly and thoroughly to avoid any damage to the metal parts of your boat.
When using any acid-based product, it is crucial to follow the directions on the container and take the necessary safety precautions. Wearing protective gear, such as gloves, safety goggles, and respirators, is highly recommended to avoid any potential hazards. Additionally, make sure your boat is in a well-ventilated area before using these types of products.
- Prepare the hull cleaner by mixing it with water, following the instructions on the product label.
- Dispense the mixture onto the stained areas of the hull using a pump garden sprayer.
- Scrub the area with a brush and then power wash or rinse it off thoroughly with clean water.
- If necessary, repeat the process until the stains are removed.
- Once the stains are removed, buff the area with polish or wax to seal off the pores and restore the shine.
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Removing mildew stains
Mildew stains are a type of organic stain, caused by organic matter such as bird droppings, aquatic plant or animal secretions, and spilled food and drinks. To remove mildew stains from a fiberglass boat, you will need to use a specialised mildew stain remover.
Firstly, ensure you are wearing protective clothing, such as gloves, safety goggles, and kneepads. Move your boat away from the water to avoid polluting it. Next, use a pressure washer or scrub brush to remove any loose material, such as algae or slime.
Now, apply your chosen mildew stain remover to the affected areas, following the manufacturer's instructions. You may need to let the product sit for a few minutes before scrubbing with a medium/hard brush and rinsing with lots of water. If you are using a product that contains oxalic acid, such as Starbrite Hull Cleaner, be extremely cautious to avoid contact with metal, especially aluminium and galvanized steel.
If the mildew stains are particularly stubborn, you may need to try a different approach. One option is to use a heavy cut compound, such as a 2000-grit wet sandpaper, to buff out the stains. This will require a lot of elbow grease, but it can be effective. Another option is to use a colour restorer, but be aware that these products can flake over time, so you may need to apply multiple coats. Always read the labels on any cleaning products and follow the safety instructions provided.
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Cleaning barnacles
Removing barnacles from a fiberglass hull is a strenuous and time-consuming job. The sooner you start removing them, the less time they will have to grow and multiply. The fewer the barnacles, the less likelihood there is of damaging the hull while removing them.
If you have a large number of barnacles encrusted on your hull, you will have to put in several hours of heavy-duty removal work. You may even need to completely sand and repaint the hull once you are done. If your hull has only a few barnacles or patches of small barnacles, you can start by scraping them off.
Use a scraper made from hard wood or plastic that is stiff enough for the job, but will not scratch the fiberglass. Use a garden hose to rinse clean. Depending on the extent of the growth, you may have to repeat this several times until all of the barnacles are off. After you remove the shells, it is common for the barnacle adhesive (barnacle rings) to remain. Re-application and scrubbing or scraping should get all of the adhesive material off.
To remove barnacle rings, you can use Algae Strip or Green Genie. Apply the chemical to the barnacle rings, let it work for 20 to 45 minutes, and then scrape the rings off with a plastic or wooden scraper.
Once all the barnacles and rings are removed, wash the hull and assess the damage. If the barnacles have left behind a circular calcium foundation known as a husk, carefully remove as much of the husks as possible with the scraper without damaging the gelcoat or paint. Apply a calcium remover or a mild acid such as oxalic or phosphoric acid, found in hull cleaners, to remove the husks that don't scrape off. Apply the chemical to the husks, let it penetrate them, and rinse away with water. A couple of applications and gentle scrubbing with a nylon brush may be necessary to remove the husks.
After removing the barnacles, you can restore the finish and protect your hull and sterndrive by washing the entire hull with Boat Clean Plus and then giving it a good scrubbing with Boat Scrub. Use a Marine Power Mitt for this as it will cut your labour and will not scratch. If the fiberglass is oxidized, rub away the oxidization with Boat Scrub and a soft cloth, T-shirt material, a small section at a time. To protect the bottom against osmosis blisters and future fouling, apply 2 coats of VS721 Bottom Coat below the waterline and Premium Boat Shine on the hull. You can use VS721 Bottom Coat on all underwater surfaces, including the sterndrive, but not on the props as it’s so slippery it will cause the props to cavitate and you will lose speed. Try to get the VS721 Bottom Coat as far into the sterndrive water intakes and through-hull fittings as possible. This will inhibit future attachment of barnacles and algae.
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Protecting the gelcoat
Firstly, it's important to understand the types of stains that can occur on fiberglass boats. These can be broadly categorized into mineral and organic stains. Mineral stains include those caused by calcium, limescale, rust, salt, and mineral deposits. On the other hand, organic stains are a result of discolouration from bird droppings, aquatic plant or animal secretions, and spilled food or drinks. Knowing the type of stain you're dealing with will help you choose the appropriate cleaning products and methods.
When selecting cleaning products, always choose those specifically designed for fiberglass boats. Avoid using harsh chemicals that can damage the delicate gelcoat surface. A simple soap and water wash is often a good starting point. Use a specialized boat cleaning soap, mixed according to the instructions, and apply it with a long-handled soft brush or sponge. Rinse thoroughly with fresh water afterward.
If you're dealing with mildew stains, apply a specialized mildew stain remover. For more challenging stains like oil and grease, a degreasing formula is necessary. Apply a non-scratching degreasing product with a damp cloth and then wipe it off with a microfiber towel. You can also use a spray-on-and-rinse-off degreaser for convenience. Remember to always let the boat dry completely before moving on to the next step.
For more stubborn stains, you can consider using hull cleaners or oxalic acid, which is often the active ingredient in these cleaners. However, exercise extreme caution when using these products, as they can react with certain metals. Always follow the safety instructions on the product labels, and ensure your boat is in a well-ventilated area when using any chemicals.
Finally, to restore shine and protect the gelcoat, consider using a colour restorer or wax. If you opt for a colour restorer, choose one that won't scratch or damage the gelcoat, and be prepared to apply multiple coats annually. Alternatively, you can use wax to buff out any tiny surface scratches that may have occurred during the cleaning process.
By following these instructions, you can effectively protect the gelcoat on your fiberglass boat, ensuring it maintains its appearance and value for years to come.
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Frequently asked questions
There are a variety of products that can be used to remove stains from a fiberglass boat. For organic stains, such as bird droppings or food and drink spillages, use a specialist fiberglass stain remover. For mineral stains, such as rust, use a product like CLR Calcium Limescale & Rust Remover. For waterline stains, use a product like Algae Strip or Waterline Stain Remover. For scuff marks, use Boat Scrub. For mildew, use a specialised mildew stain remover. For general cleaning, use a specialised boat cleaning soap, or a hull cleaner such as Starbrite Hull Cleaner.
First, move the boat away from the water to avoid polluting it. Next, use a pressure washer or scrub brush to remove any soft growth, such as algae or slime. Then, apply a specialist cleaning product, such as those listed above, following the manufacturer's instructions. If necessary, use a scraper made from hardwood or plastic to remove any remaining barnacles. Finally, rinse the boat with a garden hose or pressure washer.
Always wear protective clothing, such as gloves, safety goggles, and kneepads, when working with chemicals. Be sure to work in a well-ventilated area. If using a product that contains oxalic acid, do not allow it to come into contact with metal, especially galvanized steel and aluminum, as it will cause damage.
