U-POL weld thru primers

[Roger J.]

Hey Len (and others),, I was poking around at the U-pol website, and noticed that they sell 2 different weld-thru primers. One contains zinc, and the other contains copper. Have you used both of these primers?. And which one did you like best?

[MARTINSR]

Interesting, I have only heard of the zinc containing weld thrus. I would love to give the copper a try.

Brian

[Doug S]

If the purpose of weld through primer is to give corrosion protection to the area, then the zinc based U-Pol makes sense in that zinc is sacrificial to steel in an electrolyte. Copper is just the opposite. Remember school experiment where copper and zinc pieces are placed inside a lemon to make a single cell battery. Does U-Pol say what the two are recommended for?
Regards,
Doug S

[Bob Hollinshead]

3M's newer weld through coating in the purple spraycan works well. 3M cured the sprayability and viscosity problem and the stuff welds great.

[Roger J.]

From the U-Pol website... hope this is ok Len.

Weld #2 - Weld Through Zinc Primer

FEATURES:
High adhesion, super conductive Zinc rich Weld Through Primer

BENEFITS:
Effective rust protection for SPOT, MIG and TIG welding.
High purity zinc gives excellent conductivity.
High adhesion to metals. Durable, semi flexible metallic finish leaving an effective corrosion resistant surface.

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Weld #2 Copper - Weld Through Copper Primer

FEATURES:
High adhesion, super conductive copper rich Weld Through Primer

BENEFITS:
Offers excellent rust protection for SPOT, MIG & TIG welding applications.
High purity copper provides excellent conductivity & adhesion to metals.
Fast drying formulation speeds up the welding process.