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Old 10-29-2009, 07:24 AM
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cold galvanizing spray vs weld thru primer?

If it is basicly the same as weld thru primer (95% zinc), can it be used as weld through primer? It's a heck of a lot cheaper.

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Old 10-29-2009, 07:42 AM
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Cold galvinizing spray is meant to be used on metal to help prevent rust. Weld thru primer is meant to be used on bare metal that is to be welded and then protected to help prevent rust. If you use the galvinize spray and weld it it will just burn off.
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Old 10-29-2009, 04:19 PM
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BTW... Get all that zinc off where you can before putting anything else on it. That stuf is ... IMO... made for places you can't get to with paint later. And it typically will keep your paint from sticking.
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Old 11-07-2009, 07:13 AM
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I was a weld tru primer fanatic until my painter swore Rust-Oleum cold galvanizing compound was better and much cheaper....Well, I tried it and it works very well....Not only can you weld through it but you can paint the inside of rockers (for instance) before welding them together.I was impressed and use it at the shop all the time now.Its runs about 5.00 a can....I sprayed a scrape piece of unprimed metal and left it outside it didnt rust...use light coats it works great....I'd like to buy it by the gallon...
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Old 11-11-2009, 08:37 PM
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Make sure when using weld through primer you apply it but then right befor you weld scratch it off the imediate weld area or it will mess with the weld itself.
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Old 11-12-2009, 05:39 AM
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I havent had that problem ,strait. The rustoleum stuff has so much metal in it it conducts electricity the welds come out pretty darn clean.I usually use epoxy primer on the high dollar work and use an aircraft rivit cleaner or a spot weld cutter to clean the area to be welded but that takes a lot of time. On used cars or collision work I just use the cold galvinizing compound and weld it up...I was very surprized how well it worked...and at 1/3 the price...
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Old 11-12-2009, 05:49 AM
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Quote:
Originally Posted by straightracer
Make sure when using weld through primer you apply it but then right befor you weld scratch it off the imediate weld area or it will mess with the weld itself.
Sort of contradicts the "weld through" part of the statement. I haven't had a problem but I am not a professional welder.
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