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Fairing & Filling Compounds

These filling and fairing compounds are perfect for structural and cosmetic fiberglass repairs. The polyester fairing compound has fiberglass embedded and can be used to fill voids in composites and other materials. The marine epoxy fairing compound is for fairing surface imperfections or corners on a variety of surfaces with excellent weather resistance, for both above and below the water line.View all Fairing & Filling Compound Videos

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Polyester Fairing Compound
Creamy Non-Sag Fairing Compound

Polyester Fairing Compound is a fibrous filler for structural repairs, bonding, and part fabrication. This smooth, white, thixotropic paste system is great for rebuilding broken, void, or damaged areas in composites and other materials. Unlike other body fillers, #4100 Polyester Fairing Compound exhibits low shrinkage, high impact strength, and excellent temperature and chemical resistance. It also has great heat and cold resistance and no bleed out. It is easy to mix, has excellent adhesive qualities, low moisture absorption, and can be applied in varying degrees of thickness. Use this versatile Polyester Fairing Compound to permanently repair damage on a boat or to smooth and shape the external surface of a part.

Using this fairing compound is simple. After prepping the surface mix #4100 with a BPO Hardener. Our kits ship with white BPO hardener, however you may want to purchase either Red or Black as an off-color mix indicator. When mixing is finished, the fiber-filled paste can be applied and smoothed with a squeegee or spreader. If your application requires a perfectly smooth cosmetic surface, after using #4100 Polyester Fairing Compound, we recommend using our #4116 Lightweight Polyester Cosmetic Filler.

#4100 is Compatible with Epoxy Resin, Polyester Resin, and Vinyl Ester Resin.
Requires BPO Hardener - 100R:2H (parts by weight).

To get the best mechanical bond, it is recommended to use #4100 Polyester Fairing Compound on rough or fibrous surfaces. Bonding applications include: composite repair, marine fabrication, FRP composites to FRP, metal inserts to fiberglass, metal to concrete, detail blocks to FRP, wood to wood bonding, and metal to metal bonding.

4100/264-A Kit contains 1 Quart Polyester Fairing Compound & 1 oz. tube of White BPO Hardener.
4100/264-B Kit contains ... 
Marine Epoxy Fairing Compound
Smooth Almost Any Surface

#4114 Marine Epoxy Fairing Compound is a smooth, creamy paste system for fairing large surface imperfections on fiberglass, wood, aluminum, and steel. This tough Marine Epoxy Fairing Compound is UV stable, weather resistant, and can be used above or below the waterline. This Marine Epoxy Fairing Compound is versatile and can be used for fairing or surface repair on wooden marine vessels, wood cabinets, fiberglass structures, and architectural items. It is even used for finishing surfaces in clean room applications. #4114 can be sanded to an excellent finish, meaning there is no need for a finish coat.

When mixed at an easy 1:1 volumetric ratio, this creamy paste can be spread easily onto damaged or rough areas to create a smooth, cosmetic surface. This color coded kit (white resin/brown hardener) indicates when a complete mix has been achieved. Apply this compound up to 1" thick with very little shrinking or sagging during cure. When cured, Marine Epoxy Fairing Compound can easily be sanded and can accept most types of primers and paints.  
Lightweight Polyester Cosmetic Filler
High Quality No-Shrink Surface Filler

Lightweight Polyester Cosmetic Filler is a versatile, two-part, creamy paste designed to fill, seal, repair, and finish surface damage on composite materials. This filler demonstrates excellent physical and cosmetic properties. When applied, this thixotropic paste quickly forms an exceptionally rigid and strong surface which can easily be sanded to a feather edge. #4116 Lightweight Polyester Cosmetic Filler will not shrink, sag, or pin-hole after curing, and it can accept virtually any paint or finish without any special surface preparation.
Requires BPO Hardener – 100R:2H (parts by weight).

#4116 Lightweight Polyester Cosmetic Filler works extremely well with #4100 Polyester Fairing Compound. For applications that require a structural repair, use #4100 Polyester Fairing Compound, a fibrous filler, to rebuild broken, void, or damaged areas, then apply this #4116 Lightweight Polyester Cosmetic Filler over the repair to achieve a smooth, cosmetic surface.

Apply catalyzed #4116 Lightweight Polyester Cosmetic Filler with a spatula or putty knife. After 15-20 minutes, this filler may be sanded to final finish. Typical applications of #4116 Lightweight Polyester Cosmetic Filler include: bass boat hull repair, composites repairs, filling composites surface porosity, vacuum mold repair, tub & bath repairs, automotive finishing, urethane mold repair, crack, dent, and crevice repair, urethane part repair, renewing worn surfaces, and much more. When cured, this filler adheres to fiberglass, SMC, RIM, BMC, plaster, graphite, KEVLAR, Steel, Iron, and Copper.

4116/264-A Kit contains 1 Quart Lightweight Polyester Cosmetic Filler & 1 oz. tube of White BPO Hardener.
  • Resin Color – White
  • Working Time (100 gram mass) – 5 ± 1 minutes
  • Finish Schedule (100 gram mass) &ndash... 
Carvable Low Density Polyester Filler
Easy to Carve, Shape and Sand

#4115 Carvable Low Density Polyester Filler is a brown, creamy, non-sag paste used to fill or repair damaged areas in composite materials and wood. It has a normal working time and a quick cure and finishing schedule allowing for incredibly fast repairs. Requires BPO Hardener – 100R:2H (parts by weight).
This filler mixes easily and can be sanded, scraped, machined, or carved. When fully cured this low density filler is semi-rigid, meaning it won't dull or damage your tools. It can be sanded to a fine feathered edge.

To use this filling compound, prep the surface and mix #4115 with a BPO Hardener. Our kits ship with white BPO hardener, which will act as a mix indicator with the brown paste. In order to more closely match a given wood grain, you want to purchase either Red or Black. When mixing is finished, the us a squeegee or spreader to apply and smooth. #4115 cures to a 60 Shore D hardness, making it similar to most hardwoods. It can be used to repair both hard and soft woods, or with composite materials. Typical applications include: wood staircases, furniture repair, composite fillets and radius areas, master models, pattern/fixtures, and for repairs to tool boards.

4115/264-A Kit contains 1 Quart Carvable Low Density Polyester Filler & 1 oz. tube of White BPO Hardener.
  • Resin Color – BrownWhite BPO Hardener offers a standard wood finish, Red BPO Hardener offers a Cherry/Cedar Finish, Black BPO Hardener offers a Wenge/Black Walnut Finish
  • Working Time (100 gram mass) – 4-6 minutes
  • Finish Schedule (100 gram mass) – 15-20 minutes
  • Cured Hardness – 60 Shore D
Lightweight Epoxy Filler
Ultra Lightweight and Easy to Sand

Extremely lightweight epoxy filler used to smooth the surface of repaired parts, fill the weave on moldless or male molded parts, and shape fillets in corners and joints. This epoxy filler provides superior adhesion to most surfaces including SMC, foam, wood, fiber glass, many metals, and even common construction materials. It exhibits no shrinkage, so you won't need to keep re-applying. It spreads smoothly with few sags, even upside down! Final contours are easily sanded with standard shop tools.  
BPO Hardener
Cream Hardeners

White BPO, Red BPO, and Black BPO are cream hardeners for use with the following Fibre Glast polyester systems:
  • #4100 Polyester Fairing Compound
  • #4115 Carvable Low Density Polyester Filler
  • #4116 Lightweight Polyester Cosmetic Filler
Our kits ship with white hardener, but you can select either Red or Black for use as a mix indicator. All hardeners are easy to use and offer effective rapid reactions.
  • Available in 2 sizes - 1 oz. and 4 oz.
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You can place an order right here on our website or, if you have any questions, call 1.800.838.8984 | 8:00am - 8:00pm EST Mon-Fri.

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Fibre Glast Development Corp.
385 Carr Drive
Brookville, OH 45309
Phone: 800-838-8984
Fax: 937-833-6555

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