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weld through zinc primer ???
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60 dart
Posted 2019-04-17 2:31 PM (#581025)
Subject: weld through zinc primer ???



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besides the zinc , what is the difference in the zinc primer/delivery and regular paint primer/delivery ----------------------------------------------later
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wizard
Posted 2019-04-17 3:20 PM (#581026 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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Been there done that - very sick, vomiting and shivering.

If you need to weld through zinc, be sure to be outside with good ventilation - or wear a breating mask with appropriate filter
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ronbo97
Posted 2019-04-17 3:53 PM (#581029 - in reply to #581026)
Subject: Re: weld through zinc primer ???


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Do NOT use before welding. Ever.

Poor quality welds. Zinc fumes are toxic and poisonous. 

These weld-thru primers are also known as cold galvanizing compound. They are best used after welding is finished to prevent rusting on clean metal. 

Ron

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mstrug
Posted 2019-04-17 7:37 PM (#581039 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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https://www.cromweld.com/weld-through-primer/

One of the primary necessities of welding is that the weld area should be free from paint or any other type of substance that could contaminate the weld. This serves to help prevent weld failure.

One of the biggest contaminants of metal is rust and corrosion. When you are planning a piping or structural job it is only natural to order the metal parts or pipe ahead of time. This means the job is not held up waiting for the metal parts or pipe to come in.

But while the metal is in storage, there is a big risk that there will be exposure to moisture, dirt or other contaminants that could corrode the metal.

Additionally, after you have completed a weld, it is imperative that you protect the welded area from rust.
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mstrug
Posted 2019-04-17 7:38 PM (#581041 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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What’s the Purpose of Weld-Thru Primer?

Weld-Thru Primer is a uniquely-designed primer that is applied directly to metal surfaces that you intend to weld. This type of primer goes on just before the welding process.

The purpose of a Weld-Thru-Primer is to prevent corrosion and rusting of the metal joints where two metal pieces are welded together.

It also helps provide permanent rust protection on the inner edges of the welded metal pieces.

When you’re welding metal parts together there are certain areas such as plugs, overlapping parts and joints where it is not easy to properly apply primer, coating or finishing substances.

For these areas, you need to spray or brush on a primer that can survive the welding process over the metal surfaces. You can then perform the welding and again spray the primer over the surface after you have completed the weld.
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mstrug
Posted 2019-04-17 7:39 PM (#581042 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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What Is Weld-Thru Primer?

Weld-Thru Primer is usually made with zinc although copper may also be used. You use it to form a seal on bare metal to prevent corrosion.

It is generally applied by spraying or brushing it onto bare metals before welding occurs. When the welding is in process, the weld-thru primer becomes liquid-like and flows into the weld pool to help protect the metal from corrosion.

The use of Weld-Thru-Primer originated with manufacturers of steel-constructed products and shipbuilders who would order metal plate, sheet or rods from the steel mill.

The metals often traveled great distances and were then stored either on the job site or in a warehouse. They could be in storage for long periods of time before they were actually used and welded into the final structure.

Oftentimes, by the time the metals were actually needed, they would have been rendered unusable due to the buildup of rust and/or corrosion due to dirt and the environmental elements. By coating the bare metal before transport and storage, protection is provided and the investment preserved.

Many people confuse weld-thru primer with paint primer. But paint primer is used for an altogether different purpose.

Weld-thru Primer is to protect bare metal from corrosion. On the other hand, a painting primer is used to cover any flaws on a surface in order for the paint to adhere and coat the metal better.
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mstrug
Posted 2019-04-17 7:39 PM (#581043 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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When Do I Need To Use Weld-Thru Primer

There are several situations in which weld-thru-primer should be used.

If you plan to store bare metal for a while before you begin your welding project, spraying or brushing on the bare metal with weld-thru-primer can protect it from corrosion.

When you are welding metal parts or panels that are overlapped, the underlapping piece needs to be protected with weld-thru primer.
It should also be sprayed or brushed on the metal joints or pinches after you have finished welding in order to protect the weld from dirt and moisture and prevent rust and corrosion.

If you are planning to paint the metal after it has been welded, you will want to spray or brush on weld-thru primer in the areas where you might not be able to get the paint into.

For the best results using a weld-thru-primer, it is best to remove any paint or coatings around the area to be welded, clean the surface with a solvent and sand it lightly.

The area to be welded should be thoroughly clean bare metal. You then want to coat the bare metal surface including any overlaps with weld-thru primer.

It is a good idea to apply 2 coats of the weld-thru-primer to all the surfaces being welded and allow 5 to 10 minutes between each coat.

Let the primer cure for at least 30 minutes before you begin the welding process to be sure it is completely dry. Some advertise - and come through on - a shorter drying time, but it’s always better safe than sorry.

Now you are ready to weld the area. After the welding process has been completed, be sure to remove any weld-thru primer that is remaining before you paint or coat the metal to ensure the paint or coating will adhere to the surface.
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mstrug
Posted 2019-04-17 7:40 PM (#581044 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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Drawbacks of Weld-Through Primer

Not everyone agrees about the need for weld-thru primer. Some feel that adding it is an unnecessary step and others feel that it can actual impede the welding process. Some of the drawbacks often cited are:

There are some people that say using it can produce welds that are brittle or very porous. However that may just be attributable to some specific brands of weld-through primer.
Others have stated that you have to spray several coats of Weld-through-primer, let each coat dry really well, then scrape the spot that you plan to weld in order to get a good and smooth weld.
Zinc weld-through-primer is not actually intended for use with MIG welding. As you weld, the zinc in the Weld-Through-Primer can cause a lot of spatter. As the paint burns off it can leave behind a sooty residue.
There was a time when all OEMs required the use of weld-through primer to reinforce the weld; however some don’t require that any longer, as they prefer to leave the OEM coat intact.
Weld-through-primer is not suitable for use on aluminum.
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mstrug
Posted 2019-04-17 7:40 PM (#581046 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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Conclusion

While there are some drawbacks to the use of Weld-Thru-Primer, as there are with any product, the benefits still outweigh the drawbacks.

In order to prevent rust and corrosion on bare metal both before and after the welding process, it is highly recommended that you use this simple, spray-on product.

Last Updated On: January 3rd, 2019
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60 dart
Posted 2019-04-18 2:20 PM (#581103 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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if i mix zinc powder with etching primer , it will do as weld through zinc primer?????????????????? ----------------------------------------------------later
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Powerflite
Posted 2019-04-18 3:50 PM (#581107 - in reply to #581025)
Subject: Re: weld through zinc primer ???



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I just paint the in-between parts of my panels with a good sealer/primer. Then lay the new panel over the top and mark the hole locations on the other one. Then take a die grinder with a small burr and lightly clear off the paint in the marked areas. Works really well and doesn't affect the weld at all.
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mikes2nd
Posted 2019-04-18 6:06 PM (#581114 - in reply to #581025)
Subject: Re: weld through zinc primer ???


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yeah it will rust if exposed to water...

simple paints dont really stop sitting water... so yes weld "thru" primer is a joke and a way to get 20$ out of a can of enamel primer...

you have to rust proof after you weld plain and simple... drill a hole and use a tube sprayer if you cant get it from outside, plug the hole...and its way better than weld thru primer.

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springsweptwing
Posted 2019-04-18 7:21 PM (#581116 - in reply to #581025)
Subject: RE: weld through zinc primer ???



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60 dart - 2019-04-17 7:31 PM

besides the zinc , what is the difference in the zinc primer/delivery and regular paint primer/delivery ----------------------------------------------later


I use the copper based upol stuff, never had a problem with it.



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mikes2nd
Posted 2019-04-18 7:57 PM (#581117 - in reply to #581025)
Subject: Re: weld through zinc primer ???


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medallion is supposed to be the best. I dont buy anything UPOL... their paints are crap...



Edited by mikes2nd 2019-04-18 7:58 PM
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w.weiland
Posted 2019-04-19 8:48 PM (#581163 - in reply to #581025)
Subject: Re: weld through zinc primer ???


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Being in the collision industry for over 23+ years. Here is the true purpose when done correctly. The weld thru will burn away from the direct area sprayed. when the weld cools down the zinc, copper or whatever material is used solidifies around the weld creating a barrier from moisture. kinda like when you solider copper

if your getting porous welds its either you as the welder, or you applied WAY to much material, your only suppose to coat the metal, NOT bury it. another way to avoid this issue is to clean out your plug holes prior to welding.

i have used it for years, when done properly you should have zero issues. end of story


poor quality welds are from people who fully do not understand welding or the science of it
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