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#2
08-14-2003, 11:39 AM
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I assume you picked JBWeld for its strength... so mixing it with ANYthing is not a good idea.
Many glues have a minimum thickness at which they work properly.Superglues need really tight fit ups... Epoxies typically do better with some " substance" to their applications. Cleanlyness is very important with stuff like this and it might be better to increase the size of the crack rather than making the JDWeld thinner...... 
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#3
08-14-2003, 12:09 PM
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I'm in a "Mechanical Engineering Technology" program at school, and I am seriously
 thinking about making a project out of testing JB weld for tensile strenth, toughness, hardness and other physical properties ....just so we could compare to it more conventional metals...and make claims like "well, that JB weld is stronger than the low-grade aluminum that is it bonding together, so they aluminum should break first." unless someone has already done this... -John
__________________
2009 Kia Sedona 2009 Honda Odyssey EX-L 12006 Jetta Pumpe Duse (insert Mercedes here) Husband, Father, sometimes friend =)
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#4
08-14-2003, 12:54 PM
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JB Weld is just an epoxy ( I think). Rather than try to use it, I would just buy a less viscous epoxy. There are tons of different kinds available. I always keep at least four or five different kinds around from plumber's epoxy which is very thick to a kind that is very close to the viscosity of water. SuperMend is about in the middle of those extremes. My local hardware store must have about 10 or 15 different kinds.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#5
08-14-2003, 04:05 PM
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An epoxy can be heated to thin it out. Use a hair drier of a heat gun. It's normal practice in the composite airplane building circles I run around in.
__________________
Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) 
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#6
08-14-2003, 04:43 PM
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Heat it before you mix in the hardener or it will "go off" too quickly. (your workable time will be shortened).
Joe
__________________
www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car
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#7
08-14-2003, 06:14 PM
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jb weld vs. Marine Tex
John (Angel),
If you're into testing, I'd love to find out how MarineTex compares to JB Weld. It is a marine epoxy for use underwater, with oil/gas, and it hard as a rock (looks like cured bondo, but very impervious). I usually keep it around for misc. boat fixes - like the mounting tabs on the fender flares for my conversion van. Also used it to attach a metal lamp fitting to the ceramic pot of an oil "hurricane" lamp. Never used JB Weld, would it be similar? Is it more metal specific? Chuck
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#8
08-14-2003, 06:56 PM
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Don't use alcohol
Alcohol in epoxy is BAD. At least if you're interested in retaining structural strength. Chemically, it will act as a chain end, and thus reduce the polymerization. There are thinners out there designed for epoxies, and in fact the thinner epoxies you can find in your hardware store are generally the real thing mixed with one of these. One we use is made by a company called PTM&W. You could probably get a free sample if you call.
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#9
08-14-2003, 07:44 PM
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I concur with mplafleur that heating will make it quite thin (great way to smooth it), it didn't seem to cut much out the workable time for me though.
__________________
Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k
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#10
08-14-2003, 10:56 PM
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Years ago we used to fix surfboards for gas money and other stuff?? When the waves were good we did not want to spend any extra time waiting for the epoxy to set up and cure. We used hair dryers. The epoxy wasn't as strong due to the decreased curing time, however, boy did it get hot when accelerated. More than one surfboard went up in flames. AAAAHHH Twisted Youth!!!
Joe
__________________
www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car
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