Item Price Qty
Quart w/ White BPO hardener
Gallon w/ White BPO hardener
Quart (3 lbs)
Gallon (12 lbs)
Lightweight Polyester Cosmetic Filler
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For orders placed before 2:30PM EST

WARNING: This product can expose you to chemicals including Styrene & Titanium Dioxide (airborne, unbound particles of respirable size), which are known to the State of California to cause cancer. For more information go to

High Quality No-Shrink Surface Filler

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.

Use #4116 Lightweight Polyester Cosmetic Filler for automotive finishing, filling in surface porosity, and a number of repair applications including bass boat hulls; composites; vacuum molds; tub and bath applications; urethane molds and parts; and cracks, dents, and crevices on worn surfaces. When cured, this filler adheres to fiberglass, SMC, RIM, BMC, plaster, graphite, KEVLAR®, steel, iron, and copper.

For applications that require a structural repair, first use #4100 Polyester Fairing Compound. #4100 Polyester Fairing Compound is a fibrous putty used to rebuild broken, void, or damaged areas. Once cured, apply #4116 Lightweight Polyester Cosmetic Filler over the repair to achieve a smooth, cosmetic surface.

  • 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).

Lightweight Polyester Cosmetic Filler quart unit (#4116-A) and kit can be shipped via standard ground service without hazard charges within the 48 contiguous United States. #4116-A quart unit and kit will be subject to a hazard charge if shipped by air. Please see our Hazardous Shipping Chart for more information about hazard fees. We will consolidate items whenever possible to minimize these fees.
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Lwt Weight Fairing Compound
Nov 22, 2015  |  By Karsten
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This stuff is great and a little goes a long way.

Being a novice at best on my 1st boat Resto/Gelcoat the team at Fibreglast have been awesome in recommending what is needed to get this done.

The fairing compound is simple and a little goes along way. As with other filler putty use it sparingly and build it up in thin layers sanding between layers.

I am waiting for my 2nd order of materials from Fibreglast of the various Gelcoat Additives and hopefully after the 1st of the year I will be ordering 5 gallons of Clear Gel. a gallon of Burnt Orange to have on hand when the weather warms up.


Fiberglass Finishing
Sep 21, 2015  |  By John
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Excellent qualities, easy to work with and provides an excellent surface for painting

Lightweight Polyester Cosmetic Filler This fairing compound is available in two sizes: One quart (#4116-A) One gallon (#4116-B) This filler can be purchased as part of a kit that includes BPO Hardener. You should purchase the kit unless you already have hardener in your workshop. Kits include: One quart of filler, with one 1 oz. tube of White BPO Hardener (#4116/264-A) One gallon of filler, with one 4 oz. tube of White BPO Hardener (#4116/264-B)