1.5oz Fiberglass Chopped Strand Mat – 4" x 360" Cloth Roll – 450gsm E-Glass Repair Cloth for Seams, Cracks, Auto Body Reinforcement | Polyester & Vinyl Ester Resin Compatible

Why Thousands of DIYers and Professionals Choose This Fiberglass MatWhether you are patching a cracked boat hull, reinforcing an auto body panel, or waterproofing a roof, you need a fiberglass mat that wets out fast, lays flat, and delivers consistent strength. Our 1.5oz (450gsm) E-glass chopped strand mat is engineered for exactly that — random fiber orientation gives you uniform reinforcement in every direction, and the open fiber structure absorbs resin quickly for efficient, waste-free layups.Built for Strength in Every DirectionRandom fiber orientation: No weak axis — consistent strength whether you reinforce a flat panel or a curved hull section450gsm weight class: Thick enough for structural reinforcement, light enough for easy layering without excessive buildupAlkali-free E-glass: Resists UV degradation, weathering, and chemical exposure for lasting indoor and outdoor durabilityUniform thickness: Every square foot delivers consistent weight and stiffness — no thin spots, no surprisesFast Wet-Out with Clear Visual FeedbackThe open fiber structure acts as a resin highway — absorbing polyester and vinyl ester resins rapidly and evenly. For hand layup, target a 2:1 resin-to-mat ratio by weight. The fabric turns translucent when fully saturated — if you see white or silvery spots, that means trapped air (keep rolling). This visual indicator takes the guesswork out of wet-out, whether you are a first-time user or a seasoned laminator.Conforms to Curves — Cuts Clean with ScissorsDrape the mat over hull curves, fender contours, transom joints, and irregular surfaces without creasing or springing back. Cut to any shape with standard heavy-duty scissors or shears — no special tools required. The lightweight, flexible design makes it easy to handle for beginners while delivering the consistency that professionals demand.One Roll, Endless ApplicationsMarine: Hull repair, deck tabbing, stringer reinforcement, transom rebuilds, bulkhead bonding, bilge patchingAutomotive: Body panel repair, fender reinforcement, trunk floor patching, wheel well restoration, custom fabricationConstruction: Roofing waterproofing, concrete crack bridging, pond liner reinforcement, pool repairDIY & Custom: Mold making, surfboard shaping, RC model building, kayak repair, custom tool holders, art projectsHow to Get Professional Results — Even on Your First TryStep 1: Unroll and cut to size with heavy-duty scissors. Wear gloves and a respirator to protect against fiber irritation.Step 2: Lay the mat over your prepared surface. For curved areas, press from center outward to eliminate air pockets.Step 3: Apply resin with a brush or fiberglass roller. Work from center to edges — the mat will turn translucent as it absorbs resin. Use a bubble roller to push out trapped air.Step 4: Allow to cure fully per your resin manufacturer's instructions. Sand smooth if needed for a clean finish.SpecificationsMaterial: Alkali-Free E-Glass Chopped Strand MatWeight: 450gsm (1.5 oz/sq ft)Fiber Orientation: Random (isotropic strength)Resin Compatibility: Polyester, Vinyl EsterColor: WhiteGrade: IndustrialProcessing: Hand layup, spray-upShelf Life: 12 months from manufacture date (store in original packaging, cool & dry, below 77°F / 25°C)Package Contents1 x Fiberglass Chopped Strand Mat Roll (select your size variant above)

• PREMIUM 450GSM E-GLASS CONSTRUCTION — Built from high-quality alkali-free E-glass fibers at 450gsm (1.5 oz/sq ft), delivering an outstanding strength-to-weight ratio. Each 4" x 360" tape roll provides 10 linear feet of pre-cut reinforcement strip — ready for seams, cracks, joints, and edge repairs without the need to cut from a full-width roll
• RANDOM FIBER ORIENTATION — UNIFORM STRENGTH IN ALL DIRECTIONS — Unlike directional woven cloth, our chopped strand mat distributes randomly oriented fibers for consistent reinforcement in every direction. No weak axis, no directional bias — just reliable, isotropic strength whether you are reinforcing a curved hull section, a flat panel, or an irregular joint
• FAST RESIN ABSORPTION — COMPATIBLE WITH POLYESTER & VINYL ESTER RESINS — The open fiber structure rapidly absorbs resin for efficient wet-out with minimal waste. Designed for seamless compatibility with polyester and vinyl ester resin systems. For hand layup, target a 2:1 resin-to-mat ratio by weight — the fabric turns translucent when fully saturated, giving you a clear visual indicator for proper wet-out
• PERFECT WIDTH FOR SEAMS, CRACKS & EDGE REINFORCEMENT — The 4-inch width is purpose-built for targeted repairs: reinforcing seams on boat decks, patching cracks in auto body panels, wrapping pipe joints, and bonding edges. Cuts cleanly with standard scissors. Flexible enough to conform to curves and corners without creasing — ideal for both professionals and first-time DIY users
• UV & WEATHER RESISTANT — BUILT FOR LONG-LASTING RESULTS — Alkali-free E-glass resists UV degradation, weathering, and chemical exposure for durable indoor and outdoor performance. Ideal for boat hull repair, deck reinforcement, auto body restoration, roofing waterproofing, pond liner repair, pool patching, and custom mold building. Always wear gloves, long sleeves, and a respirator when cutting and handling fiberglass cloth