10 best fiberglass filler powder for 2024

We spent many hours on research and managed to find top 10 fiberglass filler powder that is best suitable for you. This review is based on reliable sources, product specs, and hundreds of customer reviews. In this article, were going to highlight the main features of the best fiberglass filler powder and why they are important when it comes to choosing the right one.

Best fiberglass filler powder

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1. 1/4" Chopped Strand Mat Fiberglass Fibers Quart

Feature

1/4" Chop Strand Fiberglass Fibers
Add to Polyester or Epoxy Resins
When mixed with various resins it can create a high density and compression strength putty
Excellent for repairs Can be blended with other fillers for a custom mix
Fasco Has been Manufacturing Epoxy compounds and coatings since 1957 Made in the USA

2. West System 406-2 Colloidal Silica 1.7 oz

Feature

406 Colloidal Silica is an epoxy thickening additive used to control the viscosity of the epoxy.
Prevents epoxy runoff in vertical and overhead joints.
Creates a smooth mixture, ideal for general epoxy bonding and filleting.
Used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds.
Cures to an off-white color.

3. J-B Weld 8237 PlasticWeld Plastic Repair Epoxy Putty - 2 oz.

Feature

J-B WELD PLASTICWELD: A hand mixable two part epoxy putty stick that is formulated to repair and rebuild various plastic compounds and surfaces. J-B Weld PlasticWeld is designed for DIY plastic repairs on ABS, PVC & CPVC pipes and plastics, auto bumpers and more! PlasticWeld is certified by the NSF and is safe for contact with potable water.
CURE AND SET TIME: After kneading the two part formula together by hand, PlasticWeld takes 25 minutes to set and cures in 3 hours. J-B Weld PlasticWeld set and cure color is off white.
PRODUCT FEATURES AND STRENGTH: J-B Weld PlasticWeld has lap shear strength of 600 PSI. PlasticWeld can withstand continuous temperatures up to 250oF (121oC) and intermittent temperatures up to 300oF (148oC) when fully cured. PlasticWeld does not shrink and can be molded, shaped, sanded, drilled and cut.
APPLICATIONS: ABS, PVC & CPVC pipes and plastics, auto bumpers and trim, vinyl surfaces and siding, marine repairs & fiberglass parts, plastic water tanks, and plumbing.
Repair and rebuild any rigid and semi-flexible plastic including ABS, PVC and CPVC
Bonds instantly
Superior strength
Will not shrink or pull away
Rebuild automotive trim, fiberglass parts and vinyl siding
DO IT YOURSELF: Big or small, you can DIY it with J-B Weld. Our heavy duty epoxy and adhesives repair & restore it right the first time. J-B Weld delivers superior performance, quality, and results for the Worlds Strongest Bond.

4. White Glass Microspheres - Filler for Epoxy and Polyester Resin - Quart Tub

Feature

Sands Easy Added to epoxy or polyester to make a lightweight fairing compound
Also Called Glass Bubbles
Microspheres Improves the Weight to Strength Ratio Improves Dimensional Stability
When added with our cabosil (equal parts by volume) it makes a great general purpose putty
engineered hollow glass microspheres

5. System Three 3105S16 White Silica Thickener, 1 Quart Tub

Feature

An excellent thixotropic agent which is used to control viscosity of mixed epoxy systems
Can be used alone for a very smooth, non-sagging, high strength mixture or combined with fillers or fibers to make them non-sagging
Also referred to as colloidal or fumed silica
Item Package Dimension: 4.75" L x 4.75" W x 5.5" H

6. Cabosil - Fumed Silica Thickener in Quart Tub

Feature

Hydrophilic surface
When blended into sticky and poorly flowing powder systems, Cabosil reduces angle of repose and improves powder flow.
Can be used for reinforcement of silicone rubber and can be used to reinforceorganic rubbers
Imparts good increase in hardness, tensile and elongation. Imparts significant increase in viscosity in liquid systems
Also referred to as colloidal or fumed silica

7. Ding All Q-Cell Filler- 12 oz. Bag for Surfboard Ding Repairs, Boat and Fiberglass Repairs

Feature

SUPERIOR PRODUCT: Ding All Q-Cell Filler- 12 oz. is a super fine powder which is great for bulking out fillers for larger dings, effective replacement for foam and cures a bright white finish.
THICKENS RESIN: Ding All Q-Cell Filler is used to thicken Polyester and Epoxy resin to create a Foam White fill paste that is easy to sand. When added to polyester or epoxy resin, Q-CELL filler thickens the resin to make it more workable and expands it to fill in large areas and reduce the overall weight, especially in applications where a light weight is of primary importance.
ECONOMICAL DING REPAIRS: Q-CELL provides an economical way of extending resin by reducing the amount of resin required.
FILLING INSTRUCTIONS: Q-CELL is added to resin at the rate of 5% -10% by weight dependent upon application, and up to 20% can be added if a paste consistency is required. Q-CELL is only a filler and should be sealed with a coat of resin before use.
MADE IN THE USA: Available in 12 oz Ding All Q-Cell Filler is proudly MADE IN THE USA and is great for surfboards, boats, and other fiberglass repairs.

8. 1 Pounds Chopped Fiberglass Strands 1/4" E-Glass Fibers

Feature

It is loose chopped strands of E-glass fibers, Length - from to 5/16 (6 mm to 8 mm)
This short fibers provides greater strength for castings & reinforce fillets in parts which are not easy to laminate or reinforce
This strands are alkali resistance
Provide good mechanical strength
Inorganic fibers are non-flammable, good chemical resistance

9. WEST SYSTEM 404-15 High-Density Filler 15.2oz, Off-White

Feature

West System 404 High-Density filler is the most cost-effective and easiest-to-use filler for hardware/stud bonding.
Blended with epoxy, it makes an excellent gap filler or structural fillets.
Can blend it into any West System 105 Resin/Hardener combination, G/flex Epoxy 650, or G/5 Five-Minute Adhesive.
Cures to an off-white color.

10. 1/4 Inch Chopped Fiberglass Strands - 100% E-Glass Fibers for Bulk Molding Compound and Filler Reinforcement - Epoxy/Polyester/Vinyl Ester Compatible

Feature

High strand integrity and low fuzz
Excellent flow-ability
Easy control of glass loading
Excellent mechanical properties
Good electrical insulation properties

Conclusion

By our suggestions above, we hope that you can found the best fiberglass filler powder for you. Please don't forget to share your experience by comment in this post. Thank you!