Ratings may include incentivized customer reviews.
What Customers Are Saying
This hardener is an essential component for using the Bondo body filler effectively. Reviewers noted that the small amount included with the filler is often insufficient, so having an extra tube on hand is very helpful. The hardener is described as working well when properly mixed, allowing the filler to harden and sand smoothly. Reviewers appreciated the red color, as it makes it easier to see when the mixture is fully combined. Overall, this hardener is seen as a reliable and necessary product for successful Bondo repairs and restorations.
Customer review summary generated by AI, including incentivized reviews.Works well with resin
Would RecommendI used this with some fiberglass resin I had on the shelf from a different manufacturer. The hardener worked well with the resin, forming a very strong bond on the fiberglass and the glass mat. The resin dried hard with no stickyness.
Verified Purchaser
Another great 3m product
Would RecommendI go through loads of these. We take on a lot of guys just out of school and they end up misplacing the small tube that comes with the body filler. Very convenient that it works multiple 3m products that we use daily.
From 3m.com
"Rondo"
Would RecommendSometime I need to really thin bondo body filler. I do this by mixing Bondo body filler with a little bit of Polyester fiberglass resin. To this I mix in the normal amount of Bondo hardener and a few drops of this fiberglass resin activator/hardener. Working very quickly I get a body filler that is fluid like, that spreads like cake batter. I apply it with a disposable brush. It gets as hard as stone. It's a bit hard to sand and you must work fast.
Verified Purchaser
Bondo Buddy
Would RecommendMake sure you realize that the plastic tube is very cheap plastic and will deteriorate over time when stored. It cracks and breaks and you lose your hardener.
Verified Purchaser
Not an accurate way to measure
Would RecommendOverall it works, but the entire system has rather vague measurements. It’s pretty easy to not add enough hardener.
Verified Purchaser
Bondo 2.75 oz. Red Hardener
Would RecommendWorked well. Must work quickly or it will harden, therefore, must do it again.
Verified PurchaserSweepstakes
Works great
Would RecommendUsed this to fix a whole where bent pipe was removed from wood siding. Looks great
Verified PurchaserSweepstakes