John -
I agree with Burt. The weld thru primers result in poor
welds, often coming apart. Once again, the metal must be clean for a
good weld to happen. An additional drawback of weld thru primers is that
the burning zinc fumes will have you coughing uncontrollably for several days
afterwards. I speak from experience.
The best use for them is on blind panels (back of rockers,
for example) or after lap welding to keep corrosion from taking
place.
Ron
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