U-POL weld thru primers
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?
Interesting, I have only heard of the zinc containing weld thrus. I would love to give the copper a try.
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?
3M's newer weld through coating in the purple spraycan works well. 3M cured the sprayability and viscosity problem and the stuff welds great.
From the U-Pol website... hope this is ok Len.
Weld #2 - Weld Through Zinc Primer
High adhesion, super conductive Zinc rich Weld Through Primer
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.
Weld #2 Copper - Weld Through Copper Primer
High adhesion, super conductive copper rich Weld Through Primer
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.