Issues with epoxy bond under filler

Humour me...while we are talking fillers, what do most of you use for filling the roof/quarter joints?
I think the angle for metal to metal was selling a more environmentally safe metallic joint compound that was healthier to use than lead. Its pretty much that simple. I think the mind goes to metal and the old use the magnet to find filler trick when buying a car. The metal stands out, but neither the lead or the aluminum paste will be magnetic at that joint anyway.
 
"Think about it for a minute have you ever seen what happens to steel that touches alum.? Have you ever tried to take an antenna nut off a fender how about a wiper arm after it's been on for awhile.... Think before using the products from the gifted mouth of a horses ass salesman or believing the lies of a marketing asshat"

So your saying the reaction of aluminum to metal creates an extraordinary bond?
 
"Think about it for a minute have you ever seen what happens to steel that touches alum.? Have you ever tried to take an antenna nut off a fender how about a wiper arm after it's been on for awhile.... Think before using the products from the gifted mouth of a horses ass salesman or believing the lies of a marketing asshat"

So your saying the reaction of aluminum to metal creates an extraordinary bond?

I don't think galvanic corrosion under paint would hold up long term, sooner or later it would have to show up, no?
 
Just a quick update. I am 1/2 done stripping the primer back down to bare metal.

Found lots of small areas that as primer was being sanded off and almost gone but with still a thin layer left, they looked soft. These were mostly areas that did not have any filler on them, just primer. I could easily scrape the primer off leaving bare metal below. I could also clearly see as the primer was removed that there is a black film on the metal. If I sanded the bare metal a bit more I could get through the black film and the metal below was shiny. Using my finger, I can feel that the darker areas are very smooth compared to the shiny sanded areas, even though the panels were originally DA'd with 80 grit.

100% without a doubt, this would have been a catastrophe sometime later.

Still have tons of work to do to get these panels cleaned up and ready for primer again, but definitely glad I chose to start over.

Thanks

Michael
 
be happy. you have learned a very valuable lesson about acid . had you continued you would be peeling off color and clear.
 
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