






🛠️ Fix it once, fix it right — waterproof strength that lasts!
J-B Weld Fiberglass Resin is a premium two-part resin system designed for durable, waterproof repairs on a variety of surfaces including fiberglass, plastics, metal, and concrete. It cures in just 2 hours and works best when combined with fiberglass cloth or mat for reinforced strength, making it ideal for marine, bath, pool, and automotive repairs. Highly rated for its reliability and ease of use, it’s the go-to solution for professionals and DIY enthusiasts aiming for long-lasting fixes.






| ASIN | B0CGKHL5TR |
| Best Sellers Rank | #11,964 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #17 in Pool & Deck Repair Products |
| Brand | J-B Weld |
| Customer Reviews | 4.6 4.6 out of 5 stars (489) |
| Date First Available | August 24, 2023 |
| Item Weight | 2.46 pounds |
| Item model number | 40122 |
| Manufacturer | J-B Weld |
| Manufacturer Part Number | 40122 |
| Model | J-B Weld Fiberglass Resin - Quart - Bath, Marine & Auto |
| Product Dimensions | 4.63 x 2.38 x 7.5 inches |
L**K
Repar fiberglass
Best quality. Value pricing. Function used terrific.
B**X
Creates a great bond and gets the job done
I purchased this and fiberglass cloth to make an emergency repair of a 12' tall Skeleton yard decoration. The giant skeleton had fallen over during a nasty surprise thunderstorm and landed on the shoulder. The impact cracked the right arm and shoulder housing and broke several plastic ribs. After failing with epoxy and other plastic adhesives, I switched to a fiberglass solution. Using the Bondo Fiberglass Cloth (20128, 8 Sq Ft) and this resin, I was able to rebuild the broken shell of the plastic bones and harden the shoulder, arms, neck, and ribs like iron. Literally just brushed the resin onto the fiberglass strips and let it cure. I had never worked with either product, so the surprise at the ease of use was extraordinary. The resin brushes on like a thick stain or PVA glue. It bonded with the fiber cloth and created an extremely strong fiberglass shell. I ended up using it to reinforce several other decorations. It does not take much, and even after multiple fixes, I still had a lot of resin left over for emergency repairs. If you need to fix something, especially outdoors, this stuff works amazingly well. I only used it with the fiberglass cloth, so I cannot speak for the resin as a stand-alone product. However, based on how well it worked with the added cloth, I have no doubt it would work just fine as a bonding resin without the cloth. Highly recommend this product for repairs or strengthening. Great for Holiday repairs and rebuilds, especially if you have older models of props and decorations for outdoor display that are no longer sold.
R**S
Great resin
Excellent product
J**N
Perfect coverage.
Used it to build my daughter a 7 ft lighthouse. It worked very well. Easy to use.
D**9
Works Great, but Read and Follow Directions
I always trust JB-WELD products, and this is no exception. It performed exactly as advertised. Do make certain that you use a proper respirator and ventilation; this stuff has potent vapors. Also be mindful of how quickly it sets up. If you mix up more than you can use in 2-3 minutes, you will end up wasting a lot of resin. This is all covered in the directions, just be certain to read and follow.
T**.
Worked Perfectly!
Used this to repair a while in my SUV fender Worked perfectly. Easy to work with Be sure to get a hardener as well like MEKP
J**S
Old ! Solidified in the container !
This crap was no good, solidified in the can ! It’s a good product but the distribution people knew it was bad and shipped it anyway. Selling their old stuff to mail order people ! Be aware of the seller !
J**Y
Used on a boat.
This stuff is the bomb. Working on an old John boat. Ceiling up the wood transom. This stuff is a great way to do it with. Highly recommend. It arrived in good packaging and no leaks. Worth the money.
Trustpilot
3 weeks ago
2 months ago