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Antique Tractor Paint and Bodywork

Slow Drying Bondo-- What to do??

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Old Farmer

03-26-2005 07:26:43

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Having not used body filler for over a year, yesterday I spotted some spt welding "dimples" on a set of repo fenders with Bondo. Evidentally I did not use enough hardener, because it is drying/setting up very slowly. Will it eventually dry??? (After 24 hours it has made some progress). Thanks for the help!!

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greenbeanman in Kansas

04-01-2005 20:06:21

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Re: Slow Drying Bondo-- What to do?? in reply to Old Farmer, 03-26-2005 07:26:43

I would have readily agreed with the others until I read a particular article last year.

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.

At work I used some very old fiberglass filler that had been given to me to form a small ramp over a raised portion of concrete. The hardener I used had seperated and much of the liquid portion dribbled onto the ground before I was able to add it to what filler was in the can. It took two days for the filler to completely harden, but after a year it is still in place and extremely hard.

I certainly agree that the proper amount of hardener should be used, but if a soft spot is discovered I"d leave it unworked for several days. I"m willing to bet that you will find it satisfactory after that time.

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dr.sportster

04-02-2005 19:02:45

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Re: Slow Drying Bondo-- What to do?? in reply to greenbeanman in Kansas, 04-01-2005 20:06:21

The article may be true however I did this last year and after two or so days I could no longer wait and used some cheapo wood chisels to start over by lifting away the undried mess.It also seemed that it would not ever be right and a good point to remix correctly.How patient each guy is could be a factor but once after I saw it wasnt working for me that was the best decision. I cant even remember what it was on.Gotta make daily progress on these things or it takes forever.

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dr.sportster

03-28-2005 05:42:32

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Re: Slow Drying Bondo-- What to do?? in reply to Old Farmer, 03-26-2005 07:26:43

Do over.Seriously it will never be right.I know from dummy experience the ratio matters.

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Rod (NH)

03-26-2005 09:58:25

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Re: Slow Drying Bondo-- What to do?? in reply to Old Farmer, 03-26-2005 07:26:43

Hi,

Well, if it were mine, I'd remove it and start over with a correct mix.

Rod

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