Weld Thru Primer

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About 3 weeks ago my brother in law and I were welding my sons shock tower. I used weld thru primer because we could'nt get access behind it after it was welded but water could still get in. My brother in law used a mig and was saying it was stopping the arc. I've seen it used on tv. What was I doing wrong.
Reply:I dont know if its the same primer, but I weld c-purlin and square tubing that comes primed all the time. I use the basic .035 ER-70S6 wire and C25/Argon gas. I run it hot enough to burn the primer off ahead of the puddle. I know its not as good as bringing it down to bare metal, but for those small insignifigant jobs, it has always worked for me..............................."Look Good Doing It"!!!!!!!!!!!!!!!
Reply:The weldable primer must not be put on too thick.  You can run into problems especially when welding with MIG.  With SMAW ( stick )  It burns through the primer with little difficulty.    I have worked on some large jobs were the plate was wheel abraded then primed with weldable.  It is nice for layout and fitting but can be frustrating for welder if he hits a thick spot.
Reply:I used Radnor  Cold Galvinizing Compound  prod #64000130. I did put on 2 coats 1 coat looked  kinda thin. It was also breezy and he only had .030 wire which he knew was to heavy but my son wanted it done, you know how that goes. Thanks for the info.
Reply:Originally Posted by jericho777I used Radnor  Cold Galvinizing Compound  prod #64000130. I did put on 2 coats 1 coat looked  kinda thin. It was also breezy and he only had .030 wire which he knew was to heavy but my son wanted it done, you know how that goes. Thanks for the info.
Reply:I had heard `that welding galvanized was bad but the can even says "MIL-P46105 weld thru primer". I'm new at this and was not really sure about it.. What is the brand I should be using?
Reply:Originally Posted by jericho777I had heard `that welding galvanized was bad but the can even says "MIL-P46105 weld thru primer". I'm new at this and was not really sure about it.. What is the brand I should be using?
Reply:Originally Posted by jericho777I had heard `that welding galvanized was bad but the can even says "MIL-P46105 weld thru primer". I'm new at this and was not really sure about it.. What is the brand I should be using?
Reply:3M makes a weld through primer. Called..... 'Weld Through Primer'. It comes in an aerosol can or a can with a brush in the lid, and is dark gray in color. It is loaded with zinc of course. I have used it many times and it works perfectly. No problems with zinc fumes either, like you get welding on galv metal. You can buy this at an automotive paint store. I get mine at my PPG dealer. I have seen it at a Sherwin-Williams (auto paint, not house paint) supplier also......  pgDynasty 200 DX_set up to run on 3 phaseCoolmate 3MM 251 w/ Spoolmatic 30AHTP 625 Micro Cut Plasma CutterVictor O/A RigBridgeport Mill_3 phase10 inch South Bend Lathe_3 phaseQuincy 325 2 Stg. Air Compressor_3 phase
Reply:Thanks guys for the help and info I know I'll be on the right path.