The 7 Best fiberglass adhesives (2023 reviews)

We consider a fiberglass adhesive to be a worthy investment in the long run. We are here to help you choose the right one for your purposes from all the best available products in market today.

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Our Top Picks:

Best Overall: Buy: JB Weld Wood filler READ REVIEW

Best For Plastic: Buy: JB Weld fiberglass Adhesive READ REVIEW

Best For car mirrors: Buy: Loite fiberglass Adhesive READ REVIEW

Best For Sems body panel: Buy: West System fiberglass Adhesive READ REVIEW

Best For model airplane builds: Buy: Totalboat fiberglass Adhesive READ REVIEW

Best For bonding dissimilar materials: Buy: West System toughened Epoxy READ REVIEW

Best For applications: Buy: 3M Talc fiberglass Adhesive READ REVIEW

Best Overall: JB Weld Wood filler

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The look and feel of this adhesives are consistent with the high quality we're used to from the rest of Jb Weld's lineup. This is almost like hard plastic once it sets up. It bonds to most rigid plastics and drys to a dark grey color that can then be sanded and painted. It is easy to drill and work with this material after it hardens. The Plastic Bonder makes a great gap filler and dries black in color. It is used for a lot of epoxies. It is clear and would bring out the beauty of the wood.

The little strips of HDPE can come from milk jugs or frisbees or even the 5 gallon buckets from the big box stores as long as it is HDPE. It only hardens to what can best be described as a stiff bendiness that breaks or separates if there is too much flexing or pressure, but it does not harm the PP plastic and is easy to clean up and remove from PP if needed.

• Works on plastics that most adhesives don't adhere
• Great on plastic and similar compounds
• Easy to use hard to get off hands

Best For Plastic: JB Weld fiberglass Adhesive

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate adhesive. The jb weld fiberglass adhesive is exactly that - it's a simple adhesive that hits all the right notes. It is great to fix broken plastic bracket for an electric reclining chair. It comes in a syringe allowing for an easy. The PlasticWave Can Withstand Continuous Temperatures Up To 250Of (121Oc) And Intermittent Temperatures Up To 300Of (148Oc) When Fully Cured. The dual syringe is an excellent packaging for a two-part adhesive, making it easy to dispense equal amounts. It is rock hard and has sealed the valve.

The twist on cap keeps it fresh between uses. It drys hard enough just got to get it to stick to the surface it's attached to. The product is fairly easy to use however it will not seal it completely.

• Epoxy for auto tail light repair
• Creates a lasting bond on almost any plastic
• Worked great to fix plastic bracket

Best For car mirrors: Loite fiberglass Adhesive

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Best part: loite fiberglass adhesive costs comparatively low and it is available to ship in 24 hours. This epoxy is poisonous and should not be used for food products. It can be used as an adhesive for a wide range of materials or as a versatile filler for gap bonding, surface repairs and laminating. It is really interesting how hard this compound gets when mixed, applied and given time to dry in a crack, knot that has come loose, a crack and/or a hole in a piece of wood. It will adhere to just about anything it’s fast drying like really fast.

The epoxy when it becomes solid and cures hard, will anchor to the grout and hold for any length of time. It comes with only two mixing nozzles. It is easy to control the flow of the epoxy. It is supposed to harden and hold tight.

• Comes with 2 pre-mixing tube….single use
• Fast setting and a strong bond
• Really does set up fast and has a very strong psi

Best For Sems body panel: West System fiberglass Adhesive

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate adhesive. The west system fiberglass adhesive is exactly that - it's a simple adhesive that hits all the right notes. The tube comes with a static mixer that lets you lay down a bead of thickened epoxy with any standard caulking gun. It cleans up easily, takes paint, and can be sanded when hard. It is used to wet out light to moderate reinforcing fabrics like fiberglass. It can be used as a filler for holes.

It is perfect adhesive for fiberglass, without the trouble of mixing. It does not leave a sticky residue and can be sanded when hard. It provides a long open time but has fast thru-cure.

• Easy to use, fabulous adhesion, super super strong
• Perfect viscosity for adhesion but it can wet out too
• Epoxy with thickener is easy to use in the vertical, horizontal
• Perfect for sealing cracks, decking, whatever

Best For model airplane builds: Totalboat fiberglass Adhesive

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Not everyone likes to purchase adhesive for their daily usage, but the totalboat fiberglass adhesive would be an anomoly. Thickened, non-sagging, high-strength marine epoxy adhesive in a handy cartridge creates permanent structural bonds on wood (even hard-to- glue woods like teak), fiberglass, metals, glass, and some plastics. It is more flexible than traditional epoxy resins and stronger than conventional 1-part urethane sealants it’s ideal for building or repairing wooden boats that are prone to flexing. The best possible finish would be to rough sand it to a feathered finish with the existing finish around it, then use a filler and at least 400 grit and then gel coat it.

The epoxy can be a little difficult to shoot out of the mixing tip. The self mixing tip is fantastic, however the thickness of this product makes your typical $4 caulk gun ineffective. It can be used in temperatures as low as 40°f. Your caulking gun will stop about half way because the tube is empty.

• Great product for aluminum boat hull repairs
• Easy to use and easily sandable
• Polishes out great like any other epoxy when sanded to 2000grit

Best For bonding dissimilar materials: West System toughened Epoxy

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate adhesive. The west system toughened epoxy is exactly that - it's a simple adhesive that hits all the right notes. It is ideal for repairs to aluminum boats and polyethylene and abs canoes and kayaks. It is a two-part, toughened epoxy that can make structural bonds which absorb the stress of expansion, contraction, shock, and vibration. It can take the shocks that would crack other epoxies. It can be used on damp or wet surfaces, and even underwater when applied with specific techniques.

This adhesive has shear thinning properties, which means it moves more like a liquid when you work the material. It can take 45 minutes of working time, and ends up flexible and strong. This is easy to use and works well on Paper Stone counter top products.

• Comes in two cans and is like mixing most any other epoxy
• Awesome product, extremely thick and defies gravity
• Very strong epoxy for a pvc/plastic boat

Best For applications: 3M Talc fiberglass Adhesive

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If you want nothing less than best desirable adhesive, then 3m talc fiberglass adhesive is the one you should definitely consider, as it manages to bring a lot to the table. The M Scotchweld epoxy adhesive dp125 is a versatile, medium viscosity, epoxy adhesive that pours easily with minimal dripping, running and migration that will flow smoothly for a controlled, accurate dispensing. It maintains a strong bond under expansion, contraction and limited movement. It is ideal for bulk mixing, and with 25 minutes of work-life, there's ample opportunity to reposition.

These structural adhesives provide high shear and peel strengths, depending on the formula, and better heat and chemical resistance than other common adhesives. It is used virtually anywhere high-strength bonds are needed along with resistance to environmental conditions. It is ideal for bonding dissimilar surfaces where resistance to flexing, vibration and other stresses is needed. It provides the reliability and strength you need to maintain productive, cost effective results.

• General attachment applications in a variety of industries
• 25 minute work life with handling strength in approximately 150 minutes at room temperature
• Flows smoothly for controlled dispensing where needed
• Medium viscosity helps minimize running, dripping, or migration