Can cracked zinc sill plates be repaired?
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schwabd1
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Can cracked zinc sill plates be repaired?
I have a set of '26 roadster sill plates that are semi decent except for a couple cracks. Is zinc repairable?
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Allan
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Re: Can cracked zinc sill plates be repaired?
It will not weld. It won't take solder. You may be is to back it with some shim brass and use epoxy/JB weld to hold the shim in place. Others may have better ideas.
Allan from down under.
Allan from down under.
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Mike Silbert
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Re: Can cracked zinc sill plates be repaired?
While I have never used this product I have know about it for years.
https://www.muggyweld.com/product/super-alloy-1/
It works on Zinc and Pot metal alloys.
But I would use a backer plate to keep cracks away in the future.
No matter what it is, the chrome platers use a filler product to repair the pinholes, cracks, and defects in pot metal before plating.
https://www.muggyweld.com/product/super-alloy-1/
It works on Zinc and Pot metal alloys.
But I would use a backer plate to keep cracks away in the future.
No matter what it is, the chrome platers use a filler product to repair the pinholes, cracks, and defects in pot metal before plating.
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varmint
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Re: Can cracked zinc sill plates be repaired?
I confirm what Allan said. I tried welding zinc and it did not go so well.
What zinc does well at is forming to a mold, even more so than aluminum. I suppose you could research any safety concerns about re-pouring zinc into a mold that is made from the piece itself.
What zinc does well at is forming to a mold, even more so than aluminum. I suppose you could research any safety concerns about re-pouring zinc into a mold that is made from the piece itself.
Vern (Vieux Carre)
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Jerry VanOoteghem
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Re: Can cracked zinc sill plates be repaired?
The sill plate is a stamping, not a casting.varmint wrote: ↑Mon May 19, 2025 7:54 amI confirm what Allan said. I tried welding zinc and it did not go so well.
What zinc does well at is forming to a mold, even more so than aluminum. I suppose you could research any safety concerns about re-pouring zinc into a mold that is made from the piece itself.
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Shrshot
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Re: Can cracked zinc sill plates be repaired?
Vernon, Did you try TIG welding zinc? I have TIG welded it a few times. Tricky but doable. Set my Tig machine to AC like welding aluminum and using a non-ferrous filler rod is key. Preheating slightly seems to allow it to take the weld. A very fine line between a nice weld and total disaster. lolvarmint wrote: ↑Mon May 19, 2025 7:54 amI confirm what Allan said. I tried welding zinc and it did not go so well.
What zinc does well at is forming to a mold, even more so than aluminum. I suppose you could research any safety concerns about re-pouring zinc into a mold that is made from the piece itself.
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big2bird
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Re: Can cracked zinc sill plates be repaired?
I use Muggyweld to repair Winfield cracks. Great stuff. Low temp, like soldering. As for you sill plates, it just depends on the repair.
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John kuehn
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Re: Can cracked zinc sill plates be repaired?
Allan has the simplest repair idea that works. I have a 24 Coupe that has the zinc/aluminum sill plates and using the method that Allan spoke about is the best way for cracks in this application. It will last as long you own and drive your car and beyond.