






🛠️ Fix it fast, fix it right—waterproof your world with 3M Bondo!
3M Bondo Liquid Hardener is a professional-grade catalyst designed to chemically react with Bondo polyester fiberglass resin and metal reinforced fillers, delivering fast-curing, durable, and 100% waterproof repairs. Ideal for automotive, marine, and home applications, this easy-to-mix hardener ensures a seamless, long-lasting finish trusted by professionals worldwide.

















| ASIN | B000BO6RUC |
| Best Sellers Rank | #16,376 in Automotive ( See Top 100 in Automotive ) #29 in Body Repair Putty |
| Brand | Bondo |
| Color | Transparent |
| Customer Reviews | 4.7 4.7 out of 5 stars (588) |
| Date First Available | July 7, 2004 |
| Full Cure Time | 2E+1 Minutes |
| Global Trade Identification Number | 00076308009120 |
| Is Discontinued By Manufacturer | No |
| Item Form | Not Aplicable |
| Item Package Quantity | 1 |
| Item Volume | 11 Milliliters |
| Item Weight | 0.64 ounces |
| Item model number | 912 |
| Manufacturer | 3M |
| Manufacturer Part Number | 912 |
| Material | Plastic |
| Model | Bondo Liquid Hardener, Use with Fiberglass Resin, 0.37 Fl oz, 1 bottle |
| Number of Pieces | 1 |
| Package Information | Tube |
| Product Dimensions | 8 x 5 x 1 inches |
| Special Feature | Fast Curing, Waterproof, Durable, Efficient |
| Special Features | Fast Curing, Waterproof, Durable, Efficient |
| Specific Uses For Product | Masonry, Wall Repair |
| UPC | 076308009120 |
| Viscosity | Low Viscosity |
| Viscosity Level | Low |
| Water Resistance Level | Waterproof |
N**A
3M Bondo Hardener Review
I needed this to fix a fiberglass project on a vehicle I was restoring. The product works perfectly as expected from 3M products and I recommend using this for fiberglass or filler applications as it works very well. Easy to use and mix. Definitely the best value for the money!
B**O
Works great
Works great
C**D
Hardens
Its a tube of hardener. And it hardens resin like is intended 👌😁
P**A
Good product
This was enough for a quart of resin and had a little left over It worked well
R**D
not cheap
but a $1 cheaper than AdvanceAuto
N**Z
ES UN EXELENTE PRODUCTO
A**N
Good
Good
O**M
Get this if you need to set (harden) fiberglass resin or putty.
Good stuff to have extra on hand for sure. Had to use it to make up for some hardener that I was lacking in my fiberglass resin putty stuff cuz I used it all up too fast. 😬
M**P
Works very well.
A**E
Had to buy cuz the resin I got at Walmart was missing and lost receipt. Works just the same and was cheaper than Canadian Tire.
C**Y
Happy with this purchase received on time and in good order fair price
S**Y
Good
H**D
Bon produit
Trustpilot
2 weeks ago
1 week ago