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06-20-2013
#1
Noob
Weld-through primer?
For years I've considered trying weld-through primer to protect from rust at ground points, but I've never actually tried it. Anyone have any information or experience trying this? I've used it for welding & I'd think if it can handle passing current to form an arc shouldn't it work to pass amperage of a amp ground?
Thanks for any info. One of those old "highdeas" I've kicked around, but never looked any further into.
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06-21-2013
#2
Woobooster
Re: Weld-through primer?
How many Amps does your welder use for the arc?
Maybe measure the stuff with a DMM... just put the probes in the primer and see if it conducts...
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06-21-2013
#3
Re: Weld-through primer?
IDK about weld-through primers...but primers in general are poor barriers because of their porosity.
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06-21-2013
#4
I may be wrong here, but I don't think a weld through primer is used for its conductive abilities. It's probably used because of its ability to burn off without contaminating the weld.
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06-21-2013
#5
Noob
Re: Weld-through primer?
I have only used it on sheet metal, 10 gauge or less generally, so I haven't used but around 150 amps or so max. In theory it has always seemed to me like a good idea for protecting from corrosion. Aside from being the test dummy it's hard to say it would even work
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06-21-2013
#6
Noob
Re: Weld-through primer?
I may as well give it a try, so I've hooked a piece of aluminum channel I had setting to negative battery post & checked voltage.
12.63 at battery post
12.63 at pos post & alum channel
Two coats of weld-it
12.63 at pos post & end of coated alum
Then I added 2 more coats ,4 coats total, of weld-it (3-m weld-through primer)
12.63 at pos post & end of coated alum
3-M only calls for one to two coats 1 mil thickness max, but I did double to insure I was getting readings threw the primer. Seems to be conducting, I'd only figured it would conduct ok because it contains a good deal of zinc & alum.
Now any recommendations on checking amperage or any flaws in my initial testing? Thank you all for your time & input!
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