Q&A for How to Mix Bondo

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What's the right ratio of hardener to Bondo? For example, how much hardener should I mix in with two ounces of Bondo?

Community Answer

Mixing Bondo with the hardener is almost an art form. Start with two ounces of Bondo, squeeze out a few corn-kernel-sized drops of hardener, which is typically red in color, and begin to mix it into the Bondo. When the mixture turns a light red in color, you've got a good ratio.

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Question

At what temperature can I use Bondo?

Community Answer

I wouldn't suggest using Bondo in temperatures below 60-65 degrees. If it's a sunny day and you can't work in the shade, then avoid temperatures higher than 85 degrees in the sun.

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Question

Why do you recommend mixing bondo on something that will soak up resins and solvents in the bondo and the catalyst?

Uglymug18

Community Answer

It is not recommended. You will want to mix on a smooth almost pore free surface. You do not want to mix on something that will soak up any of the material.

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Question

I forgot to add hardener. Can I remix and apply over the same area or do I need to remove? How would I remove it if it was applied to an iron gate?

Uglymug18

Community Answer

You will have to remove the filler, if you reapply over top the bottom layer will not harden and will flake and break off. Simply scrape off the filler and clean with a rag. As long as you get most of it off a new layer with hardener can be applied.

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Question

Can I mix a whole tube of hardener in the can at once, and putty in holes?

Uglymug18

Community Answer

Definitely not. The reaction takes place quickly and you will not be able to work with all of the filler before it hardens.

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Question

How many types of Bondo are there?

Uglymug18

Community Answer

Bondo is a name brand of body filler, there are many types of body filler on the market.

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Question

Does body filler have a shelf life?

Community Answer

Yes, it does, but it depends on many factors, such as the temperature and humidity of the storage location.

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Question

Can I apply fiberglass and cloth over a plastic car bumper for repair?

Community Answer

Yes, it will be good if you make a very strong structure on the inside/backside of the bumper, then place a single layer on the front.

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