The 6 Best Boat crack fillers (2023 reviews)

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Our Top Picks:

Best Overall: Buy: 3M Great Wood filler READ REVIEW

Best For RV: Buy: 3M Boat crack filler READ REVIEW

Best For Some Applications: Buy: Hy-Poxy Boat crack filler READ REVIEW

Best For Use: Buy: U.S. chemical & plastics Boat crack filler READ REVIEW

Best For fixing scratches: Buy: Totalboat Boat crack filler READ REVIEW

Best For small Surface cracks: Buy: ANKITA Boat crack filler READ REVIEW

Best Overall: 3M Great Wood filler

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3M makes beautiful and outstanding filler with classic and higher-grade materials. The Bondo all-purpose putty is a professional strength, versatile filler for repairing interior and exterior surfaces around the home. It works great, definitely a super solid bond when you need a filler. The purpose filler is great for filling small holes or scratches, but it is also very strong for rebuilding rotted or missing pieces of the original surface.

The Bondo all-purpose putty allows repairs without tearing out large pieces of cedar siding, trim, or facia. It comes with a white hardener and has a good lid to seal up. It makes a nice hard coating that doesn't scratch up at all. The non-shrinking filler features a thicker formulation that makes it ideal for repairing vertical surfaces. It is easy to work with and sanded out smoothly.

• Hardens quickly and predictably over and over
• Durable and white resin, rather than pink, perfect for any furniture repair/walls
• Worked great for rotten wood pillar and easy to use

Best For RV: 3M Boat crack filler

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The 3m boat crack filler's material feels more premium than its price would suggest. There are multiple fire and health hazards involved in using this kit if you are careless. It will work with the fiber glass cloth. It comes with all the material needed to make the mold. It will work fine, the resin sticks to anything and is durable and waterproof. The bottle of resin needs to have some way to indicate how much has been poured out / dispensed. It will also harden slowly at 32 degrees and within a single minute at 112 degrees. The quality of the kit is well fitted with all directions and tools needed to repair small projects.

• Easy to work with, coverage was excellent
• Simple, effective, and affordable way to patch small fiberglass holes
• Good investment for long term

Best For Some Applications: Hy-Poxy Boat crack filler

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If you often find yourself scrambling for convenient and suitable filler, hy-poxy boat crack filler is your end point. Hypoxy Systems’ management has a combined experience of more than 70 years in the formulation, manufacturing and worldwide marketing of epoxy materials. This stuff has lasted over six months of daily riding without so much of a drop of oil. It includes getting the oil out of the granular structure of the damage and removing the invisible oxidation. It dries a lighter grey color.

This stuff is no joke, its tougher than a set of woodpecker lips. For this application it needs to be fuel and water proof as impact and vibration resistant. It will work fine, the parts must be clean, dry and free of any corrosion.

• Prepped well, sanded and applied to threads and surface
• Un-sanded, the product is smooth, shiny and a medium grey
• Good brand reputation

Best For Use: U.S. chemical & plastics Boat crack filler

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Compared with other filler in this category, the u.s. chemical & plastics boat crack filler has a convenient design. Duraglas(R) body filler is the original fiberglass reinforced automotive body repair filler. It works well as an adhesive and fairs out well plus easy to sand. It is ideal for use on metal and fiberglass panels. It is used for truck body repair.

The#1 short-strand fiberglass filled body fillerreinforced for superior strengthuse with fiberglass cloth for large repairsrustproof. It is great for waterproof wood repairs to fill repaired dry rotted areas. Two coats of this product over your welded and ground patch makes sure moisture will not enter your repair from the back side. This has the hair but in a short non noticeable form. This is a great product to use in fiberglass or rust repair.

• Hard as a brick, easy to use
• Sands smooth clean look when finished
• Goes on smooth, sets well, easy to sand and work with

Best For fixing scratches: Totalboat Boat crack filler

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Compared with other filler in this category, the totalboat boat crack filler has a convenient design. There is a structural compound that is super hard and really hard to sand. This lightweight cosmetic filler also has minimal shrinkage and less odor than traditional polyester fairing compounds. It is easy to maintain a feathered edge while sanding thick or thin areas, so with very little effort (and very few sandpaper change-outs) you get a perfectly smooth, pinhole-free surface that's ready for paint or gelcoat.

The viscosity polyester marine filler is easy to mix with the included mekp catalyst to achieve a smooth, creamy paste that spreads easily, feathers well, and sets up quickly, without sagging. It can be used in as little as 30 minutes, and it cures to a hard material with optimal strength and easy sanding ability. This fairing compound is white, so it works much better for fixing scratches and chips on a white boat. It has many uses including composite tooling and repair applications, but is designed for use as a fairing material only.

• A must have for any boat repair tool kit
• Great for fixing scratches on a white boat
• Lot of satisfied buyers

Best For small Surface cracks: ANKITA Boat crack filler

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Ankita has been making great filler for years, thanks to a combination of clever design and appropriate materials. One epoxy repair filler can fix fiberglass boat damage efficiently, repairing deep scratch, crack, chip, and hole in the boat, jet ski, yacht, and other water vehicles. It mixes together easily and goes on smoothly without any bonding problems. It does require a small amount of sanding and polishing, but the end result does a pretty good job of matching the original gel coat.

The epoxy fiberglass filler fills can meet your needs without the need to get a multi-part fiberglass repair kit for boats. The package includes all the tools and accessories needed for the job. If you have a small or superficial defect, this kit can repair it.

• Suitable for marine, auto and household use
• Works to fill in cracks and chips
• New and hot release