{"product_id":"bondo-bondo-hair-long-strand-fiberglass-reinforced-filler","title":"Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler","description":"\u003cp\u003e\u003cstrong\u003e3M Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler is a waterproof, fast-curing two-part body filler with up to 1\" chopped fiberglass strands for high-strength repairs on metal, fiberglass, and wood.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you need to rebuild missing sections, fill large rust holes, or restore shattered fiberglass, this reinforced filler delivers greater structural strength than standard body putties. Designed for interior and exterior use, the product combines a long-strand fiberglass formula and a cream hardener to produce a sandable, paintable compound that bonds to difficult substrates and resists shrinking and water intrusion.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this filler handle large holes and missing pieces?\u003c\/h3\u003e\n\u003cp\u003eThe long chopped fiberglass strands (up to 1\" long) add tensile strength and bulk so you can fill holes up to one inch wide without backing materials. It lets you rebuild contours and missing sections in fewer layers compared with traditional fillers that need cloth or backing strips.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFill holes and gaps up to 1\" wide without backing\u003c\/li\u003e\n  \u003cli\u003eRebuild structural sections in fewer passes\u003c\/li\u003e\n  \u003cli\u003eWorks on metal, fiberglass, and wood surfaces\u003c\/li\u003e\n  \u003cli\u003eReduces the need for additional reinforcement materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it stand up to outdoor and marine conditions?\u003c\/h3\u003e\n\u003cp\u003eThis formula is waterproof and non-shrinking, formulated to withstand exposure on cars and boats. Once cured it resists water intrusion and retains its shape, making it suitable for exterior repairs and marine restoration when paired with appropriate topcoats and corrosion-prevention measures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWaterproof compound resists moisture after curing\u003c\/li\u003e\n  \u003cli\u003eNon-shrinking to maintain filled profiles\u003c\/li\u003e\n  \u003cli\u003ePaintable to accept marine or automotive coatings\u003c\/li\u003e\n  \u003cli\u003eRecommended for both vehicle and boat repairs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow fast does it cure and how is it finished?\u003c\/h3\u003e\n\u003cp\u003eThe two-part system uses Bondo blue cream hardener included in the kit and cures rapidly—typically sandable in about 30 minutes under normal conditions. After sanding you can apply primer and paint; the cured filler takes conventional body finishes for a streamlined repair workflow.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes Bondo blue cream hardener for quicker cure\u003c\/li\u003e\n  \u003cli\u003eSandable in ~30 minutes depending on temperature\u003c\/li\u003e\n  \u003cli\u003eCompatible with most primers and paint systems\u003c\/li\u003e\n  \u003cli\u003eEasy to shape and feather for smooth finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat surfaces and repair scenarios is this best for?\u003c\/h3\u003e\n\u003cp\u003eThe reinforced filler was formulated for tough restoration jobs: rust-out areas, shattered fiberglass, and rebuilding missing vehicle body parts. It bonds chemically for strong adhesion and is versatile enough to use on interior or exterior projects involving metal, fiberglass, or wood substrates.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLarge rust or corrosion hole repairs on vehicles\u003c\/li\u003e\n  \u003cli\u003eRestoration of cracked or shattered fiberglass panels\u003c\/li\u003e\n  \u003cli\u003eRebuilding door sills, fender edges, and body sections\u003c\/li\u003e\n  \u003cli\u003eInterior structural fixes where strength and water resistance matter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this product for? Professional body shops, restoration hobbyists, marine repair technicians, and DIY mechanics who need a high-strength, waterproof filler for demanding repairs will benefit most. If your job requires rebuilding missing material, filling large holes without backing, or producing a durable, sandable surface that accepts paint, this long-strand fiberglass reinforced Bondo is designed to save time and improve long-term performance.\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: Can I use Bondo-Hair on a boat hull?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it’s waterproof and non-shrinking, formulated for marine repairs when finished with appropriate topcoats.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need backing cloth for 1-inch holes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — the long-strand fiberglass filler can fill up to 1\" holes without backing strips or fiberglass cloth.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":48086857023646,"sku":"B000CINDQ8","price":31.14,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/3m-bondo-hair-front-can.jpg?v=1785908207","url":"https:\/\/northtrailauto.ca\/products\/bondo-bondo-hair-long-strand-fiberglass-reinforced-filler","provider":"North Trail Auto","version":"1.0","type":"link"}