{"product_id":"totalboat-polyester-structural-repair-putty-gallon-fiber-reinforced-waterproof-structural-bonding","title":"TotalBoat Polyester Structural Repair Putty - Gallon | Fiber-Reinforced, Waterproof Structural Bonding","description":"\u003cp\u003e\u003cstrong\u003eTotalBoat Polyester Structural Repair Putty (gallon) is a pre-thickened, fiber-reinforced polyester filler engineered for high-strength structural bonding and bulk repairs on boats and mixed-material assemblies.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for boatbuilding and demanding repair tasks, this polyester putty combines a high-quality polyester resin with long-strand milled glass fiber to deliver a robust, impact- and crack-resistant mass that holds shape as it cures. It’s intended for structural bonding—deck-to-hull joints, stringers, liners, bulkheads—and for filling large voids where strength matters more than a factory-smooth finish. The product arrives ready to mix with the provided MEKP catalyst and cures quickly into a dense, waterproof repair suitable for above- or below-waterline work. For cosmetic finishing, follow with a fairing compound and gelcoat or topside paint.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I use this putty for structural bonding on a boat?\u003c\/h3\u003e\n\u003cp\u003ePrepare mating surfaces by removing loose material, grease, and dust. Mix the putty thoroughly with 1–2% MEKP catalyst by weight (about 1% gives 15–20 minutes working time at 70°F); apply and shape before it sets. Clamp or support assemblies until initial cure completes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMix thoroughly; use 1–2% MEKP catalyst (adjust for temperature and mass).\u003c\/li\u003e\n  \u003cli\u003eApply paste-like putty into joints, fillets, and large voids.\u003c\/li\u003e\n  \u003cli\u003eHolds shape during cure—no sagging in bulk fills.\u003c\/li\u003e\n  \u003cli\u003eAllow full cure before trimming, then overcoat for cosmetic finish if needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use it below the waterline and on different materials?\u003c\/h3\u003e\n\u003cp\u003eYes. The cured putty is waterproof and bonds well to fiberglass, wood, metal, polyester laminates and many cores, making it suitable for repairs above and below the waterline. It’s ideal when dissimilar materials must be joined with a structural adhesive.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWaterproof when fully cured—suitable for underwater repairs.\u003c\/li\u003e\n  \u003cli\u003eBonds fiberglass, wood, metal, and core materials effectively.\u003c\/li\u003e\n  \u003cli\u003eGood for hull-to-deck, stringer, and bulkhead bonding.\u003c\/li\u003e\n  \u003cli\u003eNot designed as a final cosmetic fairing—use fairing compound for smooth finish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat finishing steps are required after the putty cures?\u003c\/h3\u003e\n\u003cp\u003ePolish and finish depends on whether you need a cosmetic surface. For a smooth, paintable finish, apply TotalBoat Polyester Fairing Compound over the cured putty, sand to shape, then use gelcoat or topside paint. If leaving the putty exposed, treat the surface to prevent tackiness.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOvercoat with polyester fairing compound for a sandable, cosmetic finish.\u003c\/li\u003e\n  \u003cli\u003eAfter fairing, use TotalBoat Gelcoat with wax or Wet Edge topside paint.\u003c\/li\u003e\n  \u003cli\u003eIf not overcoating, add paraffin wax (4 oz per gallon) or PVA to cure surface skin.\u003c\/li\u003e\n  \u003cli\u003eSand after full cure to desired profile before topcoat application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does working time, mixing and safety affect my repair workflow?\u003c\/h3\u003e\n\u003cp\u003eWorking time varies by mass and temperature; a 100 g mass with 1% MEKP at 70°F gives roughly 15–20 minutes. Use the included MEKP catalyst and increase or decrease percentage to lengthen or shorten pot life. Always follow protective equipment guidelines and ventilate the workspace.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard guidance: 1% MEKP for ~15–20 min at 70°F on small masses.\u003c\/li\u003e\n  \u003cli\u003eIncrease catalyst for faster cure, decrease for longer working time.\u003c\/li\u003e\n  \u003cli\u003eWear gloves, eye protection, and respiratory protection as required.\u003c\/li\u003e\n  \u003cli\u003eDispose of waste and containers per local regulations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this product is for: TotalBoat Polyester Structural Repair Putty is aimed at boatbuilders, professional marine repair shops, and experienced DIYers who need a dependable, high-strength filler for structural bonding, filleting, and filling large voids. It’s also useful for automotive, RV, and general construction repairs where long-strand fiber reinforcement and bulk-filling without shrinkage are required. If you need a surface-ready finish, plan to follow with a fairing compound and appropriate topcoat.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this putty suitable for underwater repairs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — once fully cured the putty is waterproof and can be used below the waterline.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What amount of MEKP catalyst should I use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use 1–2% MEKP by weight; 1% yields about 15–20 minutes working time at 70°F for a small mass.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TotalBoat","offers":[{"title":"Default Title","offer_id":48082724356254,"sku":"B07BR5VNH1","price":151.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/totalboat-putty-gallon-front-label.jpg?v=1785812174","url":"https:\/\/northtrailauto.ca\/products\/totalboat-polyester-structural-repair-putty-gallon-fiber-reinforced-waterproof-structural-bonding","provider":"North Trail Auto","version":"1.0","type":"link"}