Helena Frye
Fiberglass boats are a great choice for boat owners due to their durability and structural integrity. However, they are prone to staining, which can be a frustrating issue for owners who want to keep their boats in pristine condition. The staining is often caused by a combination of factors, including exposure to UV rays, wear and tear, and the porous nature of the gelcoat surface over time. This can result in a variety of stains, from algae at the waterline to diesel exhaust, rust, scuffs, and dirt. While some stains can be removed with a simple soap and water solution, others may require specialized cleaning products and techniques. In this discussion, we will explore the reasons behind fiberglass boat staining and provide insights into effective cleaning methods and products to help boat owners maintain the appearance and value of their vessels.
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What You'll Learn
- Gelcoat: a hard, durable surface that is commonly used on hulls, decks, and cabins of fibreglass boats
- Mildew: moisture can build up and lead to mildew growth, which can be removed with a specialised product
- Rust: a common mineral stain that requires a special remover
- Organic stains: caused by bird droppings, aquatic plant/animal secretions, and food/drink spills
- Cleaning products: avoid harsh chemicals that could damage the gelcoat surface
Gelcoat: a hard, durable surface that is commonly used on hulls, decks, and cabins of fibreglass boats
Gelcoat is a hard and durable surface commonly used on fibreglass boats. Over time, exposure to UV rays and general wear and tear can cause gelcoats to become porous and dull, making them more susceptible to staining. Stains can include algae at the waterline, diesel exhaust, rust, scuffs, and dirt.
To prevent staining, it is important to regularly clean the gelcoat surface. This can be done with a good quality soap and a sponge to remove softer stains. For more stubborn stains, a stain-lifting product such as Davis FSR, TotalBoat White Knight, or Y-10 fibreglass stain remover can be used. These products typically contain a light acid in a gel form to help lift stains. For more heavy-duty cleaning, products like MaryKate's On-Off Hull & Bottom Cleaner can be used.
After cleaning, a high-quality wax can be applied to the surface to help prevent future staining. This will create a smooth and shiny surface that is more resistant to staining.
There are two main types of gel coats: general-purpose gel coats and tooling gel coats. General-purpose gel coats are softer and more flexible, while tooling gel coats are harder and more scratch-resistant. Both types are made from polyester resins that use MEKP as a catalyst. The type of gel coat used can also impact the susceptibility of the surface to staining.
To summarise, gelcoat is a durable surface commonly used on fibreglass boats that can become stained over time due to wear and tear and UV exposure. Proper cleaning techniques and the use of stain-lifting products can help remove and prevent stains, and the application of a high-quality wax can provide additional protection. Additionally, the type of gel coat used can impact the surface's resistance to staining.
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Mildew: moisture can build up and lead to mildew growth, which can be removed with a specialised product
Mildew can be a common issue for boats, especially in dark and enclosed areas. Moisture build-up can lead to mildew growth, which often results in stubborn stains. While there are various methods and products available for removing mildew, it is important to choose an effective approach that will not damage the boat's surface.
One recommended product for mildew removal is Spray Nine, available at Home Depot and West Marine. It is a disinfectant and cleaner that effectively removes mildew and also helps prevent future growth. Another popular option is Chlorox Clean-Up, which can be diluted with water and sprayed on the affected areas. After letting it sit for a few minutes, the mildew can be scrubbed away with a light soapy solution, followed by a thorough rinse and waxing.
For more severe cases of mildew, a stronger approach may be necessary. Some boat owners have suggested using a combination of bleach and water, applied with a garden sprayer. However, it is crucial to exercise caution when using bleach as it can irritate the skin and damage the boat's wax coating. Additionally, bleach is not a detergent, so it should be combined with soap or detergent for effective cleaning.
Alternatively, a 50/50 mixture of white vinegar and hydrogen peroxide with a few drops of dish detergent is recommended by some sources. This solution is reported to work well on both fabric and fibreglass surfaces. Another product specifically mentioned for fibreglass stain removal is Oxalic Acid, which can be purchased cheaply and mixed with water before being applied with a pump sprayer.
To prevent mildew recurrence, it is essential to address the underlying issue of moisture build-up and ensure proper ventilation. Additionally, polishing or waxing the gel coat can help seal the pores and create a smoother surface that is less susceptible to mildew growth. By taking proactive measures and using suitable cleaning products, boat owners can effectively remove and prevent mildew stains.
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Rust: a common mineral stain that requires a special remover
Rust is a common stain found on fibreglass boats, often caused by mild steel in the boat seats. It is a mineral stain that requires a special remover, as regular boat soap is typically not strong enough to remove it.
There are several products available that can be used to remove rust stains from fibreglass. One popular option is to use an acid-based cleaner, such as oxalic acid, which can be purchased in powder form and mixed with water. This can be applied using a pump sprayer and then scrubbed and power-washed off. Other acid-based cleaners that can be used include muriatic acid, citric acid, and Starbrite. It is important to note that acid compounds can make fibreglass porous, so they should be used sparingly and with caution.
Another option for removing rust stains is to use a product specifically designed for fibreglass stain removal, such as Davis FSR, Whink, or MaryKate's On-Off Hull & Bottom Cleaner. These products often come in the form of a gel that can be applied directly to the stain and then scrubbed until the stain is removed.
For more mild cases of rust staining, some people have found success using liquid toilet bowl cleaner, Barkeeper's Friend, or even just soap and water. It is recommended to wear gloves when using any of these products and to test a small area first to ensure that they do not damage the fibreglass.
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Organic stains: caused by bird droppings, aquatic plant/animal secretions, and food/drink spills
Fiberglass boats are made with a special outer surface resin called gelcoat, which gives them a reflective shine. However, over time, the gelcoat can become dull, porous, and more susceptible to staining. While some boat owners may embrace the aged look of their fiberglass boats, keeping the boat well-maintained is important if you plan to sell it in the future.
Organic stains are a common type of stain found on fiberglass boats. These are discolourations caused by bird droppings, secretions from aquatic plants or animals, and food or drink spills. Mildew, which can occur due to moisture buildup, is another type of organic stain. To prevent mildew growth, it is important to dry your boat thoroughly after washing it. If mildew stains do appear, use a specialised mildew stain remover to eliminate them.
To remove organic stains from your fiberglass boat, start by rinsing the boat with warm, clean water to remove any loose debris and dust. Then, mix a specialised boat cleaning soap with water in a bucket, and use a long-handled soft brush or sponge to scrub the boat's exterior. Rinse the boat again with fresh water to remove any remaining soap, grime, or debris.
If the organic stain persists, you may need to use a stain-lifting material specifically designed for fiberglass boats. Products like Davis FSR, TotalBoat White Knight, or Y-10 fiberglass stain remover contain a light acid in a gel form that can effectively remove stains. For more stubborn stains, stronger products like MaryKate's On-Off Hull & Bottom Cleaner, which contains muriatic acid, can be used. Always follow the instructions and safety precautions provided by the manufacturer when using these products.
To prevent future organic stains, it is recommended to add a protective coating of high-quality wax to the surface of your fiberglass boat. This will create a smooth, shiny surface that is more resistant to staining.
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Cleaning products: avoid harsh chemicals that could damage the gelcoat surface
When it comes to cleaning products for your fibreglass boat, it's important to avoid harsh chemicals that could damage the gelcoat surface. This delicate layer is susceptible to staining and discolouration, so you should always opt for gentle, non-abrasive products.
A good first step is to simply wash the gelcoat with a good-quality soap and a sponge or soft brush. Boat soap or marine soap is best, as it is designed for this purpose and won't damage the gelcoat. You can also use a specialised boat cleaning soap, following the instructions for mixing it with water. This simple step will help remove softer stains and is an important part of the overall maintenance of your boat.
If your boat has mildew stains, you can apply a specialised mildew stain remover. For oil and grease, a non-scratching degreasing formula or a quality spray-on-and-rinse-off degreaser product is ideal.
For more stubborn stains, there are a few options to try. Firstly, check the labels of cleaning products to see what types of stains they are designed to remove. You can also try a stain-lifting material such as Davis FSR, TotalBoat White Knight, or Y-10 fiberglass stain remover, which contain a light acid in gel form. For more intense stains, MaryKate's On-Off Hull & Bottom Cleaner is an option, as well as diluted muriatic acid—but be very careful with this, as it can be dangerous and should be rinsed well after use.
Some products to avoid using on your fibreglass boat include bleach, which can be too harsh, and any metal polishes or cleaners, especially those containing galvanized steel or aluminium, as these can damage the gelcoat.
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Frequently asked questions
Fibreglass boats have a special outer surface resin called gelcoat. This resin protects the boat's hull and gives it a smooth, reflective colour and shine. However, over time, the gelcoat can become dull and porous, making it more susceptible to staining.
The first step is to wash the gelcoat with a good quality soap and a sponge to remove any softer stains. If the stain persists, use a stain-lifting material such as Davis FSR, TotalBoat White Knight, or Y-10 fibreglass stain remover. For more stubborn stains, you may need to use diluted muriatic acid or oxalic acid.
Regular cleaning helps to maintain the gelcoat and its appearance. In addition, waxing the surface can help to prevent staining by creating a smooth, shiny surface that stains will have a harder time adhering to.
