{"product_id":"3m-glass-short-strand-fiberglass-filler-stage-2-2-56-oz-filler-1-oz-hardener-fast-curing-waterproof-repair","title":"3M Glass Short-Strand Fiberglass Filler Stage 2 — 2.56 oz Filler + 1 oz Hardener, Fast-Curing Waterproof Repair","description":"\u003cp\u003e\u003cstrong\u003e3M Bondo Glass Short Strand Reinforced Fiberglass Filler Stage 2 is a fast-curing, waterproof repair filler designed to patch rust-outs, small holes and strengthen repairs on metal, wood, concrete and fiberglass.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact kit pairs a 2.56 oz can of glass short strand reinforced filler with a 1 oz tube of Bondo Red Cream Hardener so you can complete small but demanding repairs without extra reinforcement materials. The formula is stronger than typical lightweight fillers, sands quickly, and accepts most paints—making it a versatile choice for auto, marine and home repair jobs where durability and fast turnarounds matter.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this filler handle rusted metal and small holes?\u003c\/h3\u003e\n\u003cp\u003eThe short strand fiberglass reinforcement gives structural strength to fills, allowing you to repair rust-throughs and holes up to about 1\/2 inch without backing fabric or resin. It bonds to metal substrates and resists moisture once cured, improving longevity compared with non-reinforced putties.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReinforced formula supports rust-out and small hole repairs up to ½\"\u003c\/li\u003e\n  \u003cli\u003eWorks directly on prepared metal after rust removal and primer\u003c\/li\u003e\n  \u003cli\u003eWaterproof when cured—suitable for cars and boats\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat is the working and curing time for this Stage 2 product?\u003c\/h3\u003e\n\u003cp\u003eMixed with the included red cream hardener, the filler begins to set quickly, allowing you to sand in about 20 minutes under typical shop temperatures. Fast sanding reduces downtime and lets you progress to finishing or painting sooner.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes 1 oz Bondo Red Cream Hardener for correct catalyst ratio\u003c\/li\u003e\n  \u003cli\u003eSandable in as little as 20 minutes when mixed properly\u003c\/li\u003e\n  \u003cli\u003eWorking time depends on temperature and hardener amount—follow directions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich materials and repair stages is this product intended for?\u003c\/h3\u003e\n\u003cp\u003eThis product is designed for the Fill stage of the 3M Body Repair System and is compatible with common substrates including metal, wood, concrete, masonry and fiberglass. It pairs with body fillers and glazing putties to complete a multi-stage repair workflow.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse during the Fill stage; pairs with body filler and glaze for finish work\u003c\/li\u003e\n  \u003cli\u003eSuitable on cars, boats, trim, structural patches and some masonry\u003c\/li\u003e\n  \u003cli\u003eAccepts most paints after proper priming and surface prep\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I prepare, apply and finish this fiberglass filler?\u003c\/h3\u003e\n\u003cp\u003ePrepare the surface by removing loose rust, paint and contaminants, then apply the mixed filler to the damaged area with a spreader. Once it cures, shape and sand to profile before priming and topcoating for best adhesion and appearance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean and degrease surface; remove rust and loose material\u003c\/li\u003e\n  \u003cli\u003eMix filler with provided hardener in correct proportions; apply with spreader\u003c\/li\u003e\n  \u003cli\u003eSand to shape after cure, then prime and paint as needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This compact Stage 2 Bondo Glass Kit suits DIYers, automotive hobbyists, boat owners and maintenance pros tackling small structural or cosmetic repairs. If you need a reinforced, quick-sanding, waterproof filler for metal, wood, concrete or fiberglass patches—and you value a product that integrates into the 3M body repair workflow—this kit is built for those jobs.\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 this filler be used on fiberglass boats?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The reinforced formula is waterproof and bonds to fiberglass for hull and transom repairs when properly prepared.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need extra fiberglass cloth for holes under ½ inch?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. Short strand reinforcement lets you fill small holes up to ½\" without backing cloth or resin.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":48087366074526,"sku":"B000VKZ3JM","price":38.46,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/3m-bondo-glass-front-packaging.jpg?v=1785921896","url":"https:\/\/northtrailauto.ca\/products\/3m-glass-short-strand-fiberglass-filler-stage-2-2-56-oz-filler-1-oz-hardener-fast-curing-waterproof-repair","provider":"North Trail Auto","version":"1.0","type":"link"}