How Long Does Bondo Take To Dry Without Hardener? New Update

Let’s discuss the question: how long does bondo take to dry without hardener. We summarize all relevant answers in section Q&A of website Myyachtguardian.com in category: Blog MMO. See more related questions in the comments below.

How Long Does Bondo Take To Dry Without Hardener
How Long Does Bondo Take To Dry Without Hardener

Will Bondo eventually dry without hardener?

On its own, Bondo won’t get hard. This means that it will not cure and eventually fall off after application. Because of that reason, Bondo must be used with a hardener. When you buy Bondo, you should also buy some hardener.

What happens if you use Bondo without hardener?

Without it the bondo won’t get hard. Put a small piece of bondo on a board and run a line of hardener from end to end. It will take about five minutes to mix it up and apply it. If it starts tacking up, stop applying it or you’ll mess it up.


Tech Tips: The Do’s and Don’ts of Body Filler

Tech Tips: The Do’s and Don’ts of Body Filler
Tech Tips: The Do’s and Don’ts of Body Filler

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Does Bondo filler need hardener?

Mixing Body Filler

Plastic body filler needs the filler and a hardener mixed at the perfect ratio. The mix is crucial: 50:1. Read the instructions for a clear understand.

How do you make Bondo dry faster?

You can put Bondo in the oven to harden it, for example. So anything that makes it hotter, such as hair dryers, sunshine or heat guns, will speed it up.

Will Bondo eventually harden?

Yes, it will harden eventually, but if you get tired of witing, just scape it off and put better catalyzed bondo on it. Better to go by color than amout or %. You should have a nice pink color, roughly the color of the plastic spreader. You should lessen the hardner for large batched, or warm temperatures.

How long does it take Bondo filler to dry?

Allow the putty to dry 15 minutes at 77 degrees F (25 degrees C). In cooler climates, putty may take 20-30 minutes to dry. 7. Using 3M™ Sandpaper 80 grit, sand and shape the filled area to the contour of the surface.

How long does it take for Bondo fiberglass to cure?

Quality and Durable Repairs on Many Materials

For repairs involving large holes, cracks or damaged surfaces, it works easily with layers of Bondo® Fiberglass Cloth, Mat or Cloth Tape. The two-part resin cures in 2 hours.

Why is my Bondo still tacky?

It could just be the skim on the top that stays sticky. Some lower quality fillers don’t have the additives required to stop that from happening. Try sanding it, if it remains soft and clogs your paper after that first top coat has been removed then you need to take all off.

What happens if you use too much hardener in body filler?

Adding too much hardener will result in rapid gelling of the mixture, making it hard to get coverage in time. Too little hardener will increase cure time, but there’s a point where the filler won’t ever harden and you won’t know it until you try to sand.

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Can I use liquid hardener with Bondo?

Mixing the liquid hardener in the Bondo® polyester fiberglass resin Bondo® polyester fiberglass resin, other resins and Bondo® Metal Reinforced Filler is an easy task that takes little time and effort. Even a small repair can seem complex at first.


What to do if you forgot to put Catalyst or hardener in your paint

What to do if you forgot to put Catalyst or hardener in your paint
What to do if you forgot to put Catalyst or hardener in your paint

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Should Bondo be applied to bare metal?

NO, never. bondo goes over bare steel only. Never over any kind of paint, primer, etc.

Why does Bondo harden so fast?

It’s hotter out, so the inital hardening is going to kick in faster. As was mentioned above, the bondo gets hot anyway, but you’re starting out at a hotter temp to begin with during the summer, so the hardening kicks in quicker.

Will body filler cure without hardener?

The article stated that not only will the Bondo eventually dry, but it will be harder and more dense than if a larger, i.e. proper amount of hardener be used. It also stated that when exposed to air that over time the Bondo itself will harden even without a hardener additive.

How much hardener do you put in Bondo?

Add 1 line of hardener–also known as a catalyst or fixing agent–by squeezing it out of the tube across the top of the Bondo filler. (Bondo comes with a tube of hardener.) If you add too much hardener, the mixture will gel too quickly.

Is Bondo flexible when dry?

Bondo dries hard, like a sheet rock type texture almost. It cracks really easy, not to mention seperates from its mating surface easy when flexed. For a bumper, Id use some kind of plastic filler, like duraglass or something. It dries like silicon, and it can flex a little.

Can you paint directly over Bondo?

Can You Put Bondo On Top Of Paint? A direct application of Bondo Ultimate over sanded or cured primer and paint is possible. After applying this filler, it is easy to sand.

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How long should you wait to sand Bondo?

Get Ready To Sand…

If you are doing general bodywork, leveling wavy panels, fixing small dings, etc, then wait until the filler is fully cured, about 20-30 minutes.

Will fiberglass resin harden without hardener?

Well no, it won’t harden. It might eventually go dry and crusty, but that depends on the resin, and it would be super brittle in that state anyway.


Bondo is a lifesaver for woodworkers!

Bondo is a lifesaver for woodworkers!
Bondo is a lifesaver for woodworkers!

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Bondo Is A Lifesaver For Woodworkers!
Bondo Is A Lifesaver For Woodworkers!

Is Bondo waterproof?

Bondo Fiberglass Resins and Repair Kits are 100 percent waterproof. Because they do not shrink, they are excellent sealers. Bondo Fiberglass Resin is sandable in less than 2 hours, is compatible with all paints, and creates a strong and long-lasting bond.

Why is my fiberglass still tacky?

If you noticed the sicky, tacky or runny resin on your project, don’t worry! When mixing your resin and hardener, the chemical reaction occurs. The main reason is caused by inaccurate measuring two ingredients: resin and hardener, or not mixing it thoroughly.

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