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Old Nov 10, 2010, 09:36 PM
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Bondo

Does Bondo and the hardener have a shelf life?
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Old Nov 10, 2010, 09:55 PM
ADM. 48TH FLEET
oxnard ca.
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Quote:
Originally Posted by norgale View Post
Does Bondo and the hardener have a shelf life?
about a year i think......just gotta mix it before you use it.....it does seperate.....just keep the lid on tight.....

joe
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Old Nov 10, 2010, 10:02 PM
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I have had the same can of body filler for over 2 years and its just as good aas when I bought it. That said 3M says 1 year. http://multimedia.3m.com/mws/mediawe...SevTSeSSSSSS--
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Old Nov 10, 2010, 10:09 PM
Kurt Greiner
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USA, CA, Grass Valley
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Well sealed it can last for years. If it gets hard you can stir it and add some Plastic Honey

http://www.sherwin-automotive.com/pr...product=FE1249

The hardener goes bad more quickly; I find once it gets dry it is better to get a fresh tube.

Kurt
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Old Nov 10, 2010, 10:14 PM
ADM. 48TH FLEET
oxnard ca.
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Quote:
Originally Posted by seaphoto View Post
Well sealed it can last for years. If it gets hard you can stir it and add some Plastic Honey

http://www.sherwin-automotive.com/pr...product=FE1249

The hardener goes bad more quickly; I find once it gets dry it is better to get a fresh tube.

Kurt
thanks kurt.....ya beat me to it.....
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Old Nov 11, 2010, 07:55 AM
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Thanks for the info guys. The Bondo that I have is about two years old. It was separated a bit and I mixed it up till it seemed ok. However the hardener is very fluid and I thought it may be too old to use. Isn't it supposed to be more like a paste? Mine is not thick at all and I noticed the stuff I'm putting on the boat doesn't get really hard. It's difficult to sand as the paper fills up with the bondo fast and gets all clumpy rather than sanding down smoothly.
Can you buy just the hardener? Will HD have it do you think? Pete
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Old Nov 11, 2010, 11:03 AM
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Try kneading the hardener in the tube prior to using it. Auto paint supply would have hardener.
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Old Nov 11, 2010, 11:05 AM
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Oh I did that already. It still is watery. Do you think I need to get new hardener?
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Old Nov 11, 2010, 11:10 AM
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Yup...
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Old Nov 11, 2010, 11:16 AM
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I use Evercoat, the hardener separates in the tube and gets watery. After a few minutes of kneading it turns to paste and works fine.

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Old Nov 11, 2010, 11:41 AM
Kurt Greiner
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You can purchase the hardener separately for sure from stores that supply the automotive paint trade. Probably other places too. I like the smaller tubes, which come in three colors that I know about, red, blue and less commonly, white (which I don't use). It's nice to have red and blue so you can see the layers in your filler as you sand them.

I agree with Woodybob that Evercoat polyester glazing putty is one of the best products to use for our purposes, as it is milled finer than regular Bondo. The company makes it in various types, including one which is like soft frosting and very useful for filling small areas quickly.

I have a small page on working with these products if anyone is interested:

http://wmunderway.8m.com/cont/putty/putty.htm

Kurt
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Old Nov 11, 2010, 04:33 PM
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Good link there Kurt. Thanks for posting it. Pete
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Old Nov 11, 2010, 05:05 PM
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Left some hardener in the garage over the winter, Come spring it was watery and kinda grainey, wouldn't mix back together. I don't think it freezes well. The bondo itself seemed fine, just gave it a stir. Worked fine with new hardener.
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Old Nov 12, 2010, 04:27 PM
Nickel Belter
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Technically, polyester cures when exposed to air... it just takes a loooong time. The hardener is a catalyst that speeds up the reaction, which is why Bondo and polyester resins give off heat as they cure. Bondo should last for years and years, especially if you bag the can and push out all the extra air after each use.
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Old Nov 12, 2010, 06:55 PM
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Is it the resin or the hardener that goes bad first? I have a quart of Sig polyester resin (almost full) from 1995, and as a test I mixed a small batch in a cup. Nothing happened in a few hours, so I dumped in a bunch more catalyst. Still nothing. A week later it is still very runny. What are my chances of saving this can of resin? I use epoxy and CA for most everything, but it would be handy to have a little polyester around for certain tasks.
And has anyone tried Bondo-Glass, Short Strand Fiberglass Filler? I found it at my local Home Depot. It is thick, and cures in five minutes. I tested that too on some scraps, and it seems to work well for making fillets where strength is needed. It is not easy to sand, as you would imagine. My test showed excellent adhesion wood to wood, wood to ABS, and ABS to ABS. It was only a small test and I am a bit apprehensive about using it on a project.
Does anyone have a battery of tests they like to perform to 'qualify' new products before they get used in important stuff?

Dave
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