Lightweight Polyester Cosmetic Filler is a versatile, creamy paste designed to fill, seal, repair, and finish surface damage on composite materials. When applied, it quickly forms an exceptionally rigid and strong surface which can easily be sanded to a feather edge. It will not shrink, sag, or pin-hole after curing, and it can accept virtually any paint or finish without any special surface preparation. This thixotropic filler delivers excellent physical and cosmetic properties. Apply catalyzed #4116 Lightweight Polyester Cosmetic Filler with a spatula or putty knife. After 15-20 minutes, it can be sanded to final finish. What Is #4116 Lightweight Polyester Cosmetic Filler? #4116 Lightweight Polyester Cosmetic Filler is a versatile, creamy paste designed to fill, seal, repair, and finish surface damage on composite materials. When applied, #4116 quickly forms an exceptionally rigid, strong surface that can be sanded to a feather edge. The thixotropic formulation of #4116 delivers excellent physical and cosmetic properties without shrinking, sagging, or pinholes after curing. Why Choose #4116 Lightweight Polyester Cosmetic Filler? The standout property of #4116 Lightweight Polyester Cosmetic Filler is its finish behavior: it will not shrink, sag, or pinhole after curing, and it accepts virtually any paint or finish without special surface preparation. When cured, #4116 adheres to a wide range of substrates including fiberglass, SMC, RIM, BMC, plaster, graphite, KEVLAR, steel, iron, and copper. For structural rebuilding of broken or voided areas, the fibrous #4100 Polyester Fairing Compound is used first, with #4116 applied over it for the cosmetic surface. What Are the Best Applications for #4116 Lightweight Polyester Cosmetic Filler? #4116 Lightweight Polyester Cosmetic Filler is the right choice for automotive finishing, filling surface porosity, and repairs on bass boat hulls, composites, vacuum molds, tub and bath applications, urethane molds and parts, and cracks, dents, and crevices on worn surfaces. It is the cosmetic finishing filler. Pair it with #4100 Polyester Fairing Compound when the repair must be rebuilt structurally first. How Should #4116 Lightweight Polyester Cosmetic Filler Be Used for Best Results? #4116 Lightweight Polyester Cosmetic Filler is catalyzed with BPO hardener at 100R:2H parts by weight, then applied with a spatula or putty knife. Working time is about 5 minutes on a 100 gram mass, and after 15 to 20 minutes it can be sanded to a final finish. For structural repairs, rebuild first with #4100 Polyester Fairing Compound and apply #4116 over the cured repair. Technical Specifications • Type: Thixotropic lightweight polyester cosmetic filler, off-white • Hardener: BPO, 100R:2H by weight • Working time (100 gram mass): 5 plus or minus 1 minutes • Finish schedule (100 gram mass): 15 minutes • Will not shrink, sag, or pinhole; accepts most paints and finishes Available Sizes and SKUs • #4116-A — Quart • #4116-B — Gallon • #4116/266-A — Quart kit with 1 oz BPO hardener tube • #4116/266-B — Gallon kit with 4 oz BPO hardener tube Every product Fibre Glast sells is First Quality Guaranteed, so you can finish surfaces smooth with confidence. Resin Color – Off-White Working Time (100 gram mass) – 5 ± 1 minutes Finish Schedule (100 gram mass) – 15 minutes Requires BPO Hardener – 100R:2H (parts by weight).
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