Topic-icon Weld thru primer

  • hating-painting
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2 years 6 months ago #34444

Weld thru primer.
Some people love it, others say it is no good.
What are your thoughts and what brand are you using?

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2 years 6 months ago #34446

I never really liked it,and last time I checked chrysler did not want any used on their vehicles due to contamination and crappy welds with poor penetration.In theory if you have two pieces of sheet metal ready to weld with zinc coating on them from the factory you do not need weld thru primer.I had better luck using epoxy or etch primer on bare metal flanges and always put the spotwelds back in the same spot.I preferd doing it that way instead of cleaning the whole flange to bare metal and then adding weld thru primer,it held up better against corrosion.Just my thoughts....

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  • alligatoreye
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2 years 6 months ago #34455

We use Transtar rattle can. No issues yet.

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2 years 6 months ago #34456

This is what we have used at the shop for the last 8 years..http://www.amazon.com/U-Pol-Weld-Copper-Primer-Aerosol/dp/B003TQ9NFK
I would rather leave a flange bare than use transtar.....Just sayin :whistle:

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  • chumpi
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2 years 6 months ago #34457

I rather leave the metal bare, do not like the :cens rattle can.

The following user(s) said Thank You: scalvo

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  • rs69ss
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2 years 5 months ago #34665

i like sem copper. i would have trouble with 3m and would use a broken 1/8 drill bit to clean off coating through punched holes before welding plug welds.also worked better if you let coating dry awhile.

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2 years 5 months ago #34670

I like SEM copperweld too. Works great but will have spatter if you cake it on, but not nearly as bad as other stuff I've used. I usually take my mini blaster and clean up the holes for plug welding.

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  • protek9543
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2 years 5 months ago #34742

x2 on SEM

Last Edit: 2 years 5 months ago by protek9543.

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