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10 Best Fiberglass Boat Repair Kits 2025 in the United States

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Our Top Picks

#1

Winner

TotalBoat - 512952 - Polyester Structural Repair Putty - Marine Grade Long Strand Fiber Fiberglass Reinforced Filler for Boat and Automotive Repair (Gallon Kit)

Rating
10.0
Chosen by1,144
Resin Type
Application Tools
Instructions and Support

Most important from
208 reviews

Resin Type
Has the consistency of petroleum jelly, making it easy to spread but very sticky.
Application Tools
Easy to work with, strong and forms well.
Instructions and Support
Perfect for both professional and non-professional use, though some skill is required for perfect application.

The TotalBoat Polyester Structural Repair Putty offers a comprehensive solution for high-strength structural repairs, making it suitable for a wide range of materials including fiberglass, wood, metal, and polyester laminates.

Its pre-thickened, fiber-reinforced polyester putty ensures robust filling, bonding, and bedding, both above and below the waterline. This product is specifically designed for marine applications but is versatile enough for use in automotive, construction, and even aerospace repairs.

The inclusion of long strand glass fibers enhances its strength, impact resistance, and elasticity, which is essential for heavy-duty repairs like bonding decks or filling screw holes and dents. The kit comes with a hardener (MEKP) for easy mixing and application, and the paste-like consistency helps in spreading without sagging. Additionally, it has a fast-setting time and is compatible with further finishing products like TotalBoat Fairing Compound and Gelcoat.

One downside noted is the kit's reliance on the correct ratio of hardener to achieve the optimal working time, which may require some practice to perfect. It is available in convenient sizes, including a gallon kit, catering to both small and large repair jobs.

Rating
10.0
Chosen by1,144
Resin Type
Application Tools
Instructions and Support

Most important from
208 reviews

Resin Type
Has the consistency of petroleum jelly, making it easy to spread but very sticky.
Application Tools
Easy to work with, strong and forms well.
Instructions and Support
Perfect for both professional and non-professional use, though some skill is required for perfect application.
#2

TotalBoat-409337 TotalFair Marine Epoxy Fairing Compound for Fiberglass, Wood, Aluminum and Steel (Gallon Kit)

Rating
10.0
Resin Type

Most important from
233 reviews

Resin Type
Mixes easily and is very forgiving if the mix ratio is off a little.

The TotalBoat-409337 TotalFair Marine Epoxy Fairing Compound is an excellent option for those needing to repair fiberglass, wood, aluminum, and steel surfaces on boats and other watercraft. This gallon kit offers a high-strength, lightweight two-part epoxy filler that smooths and fills dents, holes, and gouges effectively. One of its standout features is the superb bonding capability, providing a permanent and waterproof finish without pinholes, making it suitable for both above and below the waterline repairs.

The improved formula allows for a hassle-free mixing process with a 1 to 1 mix ratio, simplifying the preparation as the blue and yellow components turn green when ready. The compound is also designed to be easily spread and feathered to a fine edge without sagging, even on vertical surfaces, which is a significant advantage for varied repair needs. Additionally, it cures quickly within 4 hours at 80°F, and the resulting surface sands easily, ready for painting with compatible primers and paints.

However, it's important to note that TotalBoat Gelcoat cannot be applied directly over this compound, necessitating an additional step of applying a 2-Part Epoxy Primer or TotalProtect first. While this product excels in many areas, potential users should be prepared for this extra step to ensure proper curing if using gelcoat. With options available in different sizes, including 2-pint, 2-quart, and 1-gallon kits, users have the flexibility to choose the amount that best suits their project needs.

Rating
10.0
Resin Type

Most important from
233 reviews

Resin Type
Mixes easily and is very forgiving if the mix ratio is off a little.
#3

Polymer World- Polyester Resin 10 Gallon Kit with MEKP for Boats, Cars, Surfboard, RV, Pools,Canoes, Jetskis, Watercrafts (1, 10 Gallons)

Rating
9.9
Resin Type

Most important from
174 reviews

Resin Type
The resin works great and the company ensures quick shipments.

The Polymer World Polyester Resin 10 Gallon Kit with MEKP is a versatile solution suitable for various applications, from boats to surfboards and even automobiles or bathtubs. One of its key strengths is the ease of application, allowing for quick wetting and spreading of the resin. This makes it ideal for both spray-ups and hand layups, catering to different repair or building needs.

The resin’s excellent tackiness is another advantage, as it remains sticky for a longer period, facilitating the application of multiple layers and enhancing adhesion strength. Additionally, the resin's superior formula ensures cleaner results, preventing sagging or flowing on sloping surfaces and minimizing pattern print-throughs on gelcoat finishes. This kit includes a 2 fl oz bottle of MEKP catalyst, which means you don't need to purchase a separate hardener, adding to its convenience.

The fact that it is marketed by a Florida-based business with over seven years of experience in the boating industry adds credibility. Despite these considerations, the Polymer World Kit appears to be a reliable and practical option for various fiberglass repair tasks.

Rating
9.9
Resin Type

Most important from
174 reviews

Resin Type
The resin works great and the company ensures quick shipments.

Buying Guide for the Best Fiberglass Boat Repair Kits

When it comes to repairing your fiberglass boat, choosing the right repair kit is crucial to ensure a durable and effective fix. Fiberglass boat repair kits come with various components and specifications that cater to different types of repairs and user expertise levels. Understanding these key specifications will help you select the best kit for your needs, ensuring your boat remains seaworthy and safe.
Resin TypeThe resin is the primary component in a fiberglass repair kit, used to bond the fiberglass cloth to the damaged area. There are different types of resins, such as polyester, epoxy, and vinyl ester. Polyester resin is commonly used for general repairs and is cost-effective, but it may not be as strong or durable as epoxy resin. Epoxy resin offers superior strength and adhesion, making it ideal for structural repairs, but it can be more expensive and harder to work with. Vinyl ester resin provides a balance between the two, offering good durability and resistance to water and chemicals. Choose the resin type based on the nature of the repair and the level of durability required.
Fiberglass ClothFiberglass cloth is used to reinforce the repair area and provide structural strength. The cloth comes in different weights and weaves, such as woven roving, chopped strand mat, and biaxial cloth. Lighter weights (e.g., 4-6 oz) are suitable for small, non-structural repairs, while heavier weights (e.g., 10-18 oz) are better for larger, structural repairs. The weave pattern also affects the strength and ease of application; for example, woven roving provides good strength but can be harder to conform to curves, while chopped strand mat is easier to work with but may not be as strong. Select the appropriate cloth based on the size and type of repair.
HardenerThe hardener, or catalyst, is mixed with the resin to initiate the curing process. The ratio of hardener to resin is crucial for achieving the desired curing time and strength. Different kits may come with different types of hardeners, such as MEKP (Methyl Ethyl Ketone Peroxide) for polyester resins or amine hardeners for epoxy resins. The curing time can vary from a few minutes to several hours, depending on the hardener used. Consider the working time you need and the environmental conditions (temperature and humidity) when choosing a kit with the appropriate hardener.
Application ToolsMost repair kits come with a variety of tools to help you apply the resin and fiberglass cloth, such as brushes, rollers, mixing sticks, and spreaders. The quality and variety of these tools can affect the ease and precision of your repair. High-quality tools can make the application process smoother and more efficient, especially for larger or more complex repairs. Ensure the kit includes all necessary tools for your specific repair needs, or be prepared to purchase additional tools separately.
Instructions and SupportClear and detailed instructions are essential for successfully completing a fiberglass boat repair, especially if you are a novice. Some kits come with comprehensive guides, videos, or access to customer support to help you through the process. Look for kits that provide step-by-step instructions and troubleshooting tips to ensure you can achieve a professional-quality repair. If you are new to fiberglass repairs, consider choosing a kit with robust support resources to help you along the way.

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