To those of you who have installed frame stiffeners or other unibody plating, do you guys use weld-through primer? Does it help and is it worth it?

I'm not doing stiffeners yet, but my rear passenger bumpstop area is a little rusted. Both bolts broke when trying to remove it. I'm going drill them out and grind it down and weld a 3/16" thick plate to the uniframe with welded nuts on top to replace it and just wondering if I need to invest in this stuff.

Thanks for tips!

I used it when welding the stiffeners on my unibody. It works. Other people would say it wouldn't work.

I've seen debates about it on other forums, just wondering everyone's experience on here. Do you have a certain kind to recommend? I want to order this up before I fix up my bumpstop mount.

I used it on mine when I did my stiffies. No issues with it and I still haven't gotten around to painting them after almost a year and its held up perfectly. I see no issue with using it. I'm using it again for the frame mounts for my Clayton's crossmember.

do not use the 3M stuff. I bought it for some plating I did a few months ago and it made it a total absolute ***** to weld. I am a decent welder, but hey, maybe it was just me... I would go on some welding boards and see what some of the pros are recommending.

I used SEM brand.

I went to my local paint store and picked up a can of galvanized primer. can't remember which brand since it was over a year ago.. but it worked great. I'm not taking the time to do it on my current build since I dont live in the rust belt. but I do recommend weld primer from my experiences

can looked something like this

Awesome, thank you! I've read good things about SEM.