{"product_id":"totalboat-polyester-structural-marine-repair-putty-1-gallon-fiber-reinforced-fast-curing-for-hull-stringer-bonding","title":"TotalBoat Polyester Structural Marine Repair Putty - 1 Gallon | Fiber-Reinforced, Fast-Curing for Hull \u0026 Stringer Bonding","description":"\u003cp\u003e\u003cstrong\u003eTotalBoat Polyester Structural Marine Repair Putty (gallon) is a fiber-reinforced, fast-curing polyester putty formulated for heavy-duty structural bonding and large-volume fiberglass repairs on boats and marine components.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis one-gallon kit combines a thickened polyester resin with long-strand milled glass fiber so you can fill, bond and build up large masses without sagging or excessive shrinkage. It’s designed for jobs that demand strength—bonding stringers, bedding bulkheads, sealing major holes or joining dissimilar materials such as fiberglass to wood or metal. The product ships with MEKP catalyst to start curing; adjusting catalyst volume modifies working time for different temperatures and part sizes.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I use this putty for structural bonding?\u003c\/h3\u003e\n\u003cp\u003eMix the putty thoroughly with the supplied MEKP hardener at the recommended ratio and apply to clean, dry substrates. Press or fillet the material into joints or voids; it holds shape while curing so you can build radii and fillets in one pass. After cure, it offers a robust bond suitable for mechanical loads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMix thoroughly and add MEKP (1–2% by weight; 14 drops per ounce ≈ 1% at 70°F).\u003c\/li\u003e\n  \u003cli\u003eApply to cleaned, abraded surfaces for best adhesion.\u003c\/li\u003e\n  \u003cli\u003eTool fillets or radii immediately; putty resists sagging in bulk fills.\u003c\/li\u003e\n  \u003cli\u003eAllow full cure before drilling, trimming, or overcoating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use this putty below the waterline or on gelcoat?\u003c\/h3\u003e\n\u003cp\u003eYes — the polyester structural putty is suitable for repairs above or below the waterline and bonds well to fiberglass and gelcoat. It’s intended for structural filling rather than final cosmetic fairing; for a smooth, paint-ready surface, apply a fine fairing compound over the cured putty before final finishing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks under and above the waterline for structural fixes.\u003c\/li\u003e\n  \u003cli\u003eFor a smooth finish, overcoat with a polyester fairing compound once cured.\u003c\/li\u003e\n  \u003cli\u003eTo skip an overcoat, add an air-dry agent like paraffin wax or use PVA on the surface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and repairs is this putty best suited for?\u003c\/h3\u003e\n\u003cp\u003eIt bonds well to fiberglass, woods, metals and many composite laminates, making it versatile for boatbuilding and general repair. Typical applications include bedding bulkheads, attaching stringers, filling screw holes, repairing hull chips, and uniting dissimilar parts where strength is required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for hull-to-deck bonding, stringer and liner attachment, and bulkhead fillets.\u003c\/li\u003e\n  \u003cli\u003eFills holes, chips, dents and large voids without shrinking or cracking.\u003c\/li\u003e\n  \u003cli\u003eAlso useful in automotive, RV, home or light industrial repairs needing a strong filler.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long does it take to cure and how do I control work time?\u003c\/h3\u003e\n\u003cp\u003eCure speed depends on catalyst amount and ambient temperature. At about 70°F, a 100 g mass catalyzed at ~1% MEKP gives roughly 15–20 minutes of workable time; increasing or decreasing MEKP changes the working window. Mix only what you can use in that span and follow safety precautions when working with peroxide catalysts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard guideline: 1% MEKP = ~15–20 minutes working time at 70°F for 100 g mass.\u003c\/li\u003e\n  \u003cli\u003eAdjust MEKP to shorten or lengthen pot life; do small test mixes for unfamiliar conditions.\u003c\/li\u003e\n  \u003cli\u003eWear proper PPE and work in ventilated areas; dispose of mixed residues safely.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? TotalBoat Polyester Structural Marine Repair Putty in the gallon kit is aimed at boatbuilders, professional marine repairers, and serious DIYers who need a rugged, long-strand fiber-filled polyester compound for heavy bonding and bulk filling. If you require a high-strength structural adhesive for fiberglass, wood or metal assemblies—or need to fill large voids quickly without sagging—this product delivers economical, USA-made performance. For cosmetic surfaces, plan to follow with a fairing compound and topcoat for a finished appearance.\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 the MEKP catalyst included and how much to use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the kit includes MEKP. Use about 1–2% by weight (≈14 drops per ounce for ~1%) and adjust for temperature and mass size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I sand and paint this putty directly?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This putty is structural; for a smooth finish, overcoat with a polyester fairing compound before sanding and painting.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TotalBoat","offers":[{"title":"Default Title","offer_id":55171148775767,"sku":"B07BR5VNH1","price":145.28,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/totalboat-structural-putty-front-gallon.jpg?v=1790439205","url":"https:\/\/britishgarage.co.uk\/products\/totalboat-polyester-structural-marine-repair-putty-1-gallon-fiber-reinforced-fast-curing-for-hull-stringer-bonding","provider":"British Garage","version":"1.0","type":"link"}