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Does anyone know of something to connect two pieces of Pot Metal that is stronger than JB Weld? And which is stronger, regular JB Weld or the quick setting?
Last edited by Jonjet; 09/10/18 09:22 PM. Reason: additional info.
Jon T.
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I see the original is much stronger. 3960 PSI compared to 2426.
Jon T.
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The strength usually is not the limiting factor, it's peeling or breaking off of the base material that is the problem. There are many commercial epoxies out there that stay attached to many materials.
I'd spend some time googling what people have used for "pot metal" and then have a look at the products on Acklands Grainger site, etc to see with the product data sheets and reviews from users say. JB could be the perfect product but there are many really good specialized products out there that could work better for your particular base material. If you have an "extra" broken version of what you are fixing it would be nice to experiment.
Surface preparation is very important as well since this is a mechanical bond. I'd look at sanding or maybe glass blasting. Clean thoroughly with a wax/grease remover for painting as some solvents leave problematic residues.
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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I found some Epoxy by Gorilla Glue. It's new, similar to JB Weld but stronger. Worked great!
Jon T.
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The faster any epoxy sets, the weaker it is and the less it adheres to the surface of the material to be bonded.
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True. This Gorilla Glue set in about 10 minutes and cured in about 24 Hours, very strong!
Jon T.
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JB Weld original is probably best on the market. (My opinion) Marine Tex is a strong runner up depending on the application.
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Backyard Mechanic
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Backyard Mechanic
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Also some epoxys are affected by heat even after hardening. One I used became soft around heat.
1932 4 door Special Sedan 1916 490 Touring
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Beyond the retail epoxies mentioned, there is a whole world of commercial epoxies available. 3M makes dozens of specialized epoxies. Modern cars and collision repairs often use structural epoxies to hold panels and layers of panels together by replacing traditionally welded areas with epoxies.
We used an epoxy in an underwater swimming pool application that will spend it's entire life submerged, literally holding a massive stainless steel structured climbing wall to the side wall of a commercial swimming pool.
You have to do your homework to find what you need and then find a commercial retailer who can order in what you need but there are some amazing epoxies out there...
1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
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