I believe the answer to be yes. That's what I'd do.
I actually have problems with the idea of dx 579 on areas where fluid can penetrate a crack,pinhole or joint. I might just solvent clean and prime.
There is a school of thought to use an etch primer over lead, but the problem is, you are not supposed to apply epoxy over etch. Plus, the etch primer these days is ineffective, with no real acid activator.
In the days before ppg had the dp series, (yes i did bodywork back then), the etch and lacquer primer was all we had.
Just for clarification, is it the original lead? I re did my roof and it was a lead free material. Probably doesn't make a difference, but maybe. I didn't do anything special but I didn't use PPG products. It seems ok but its only been a couple years. We'll see in a few more. LOL.
Don't forget to wash the leaded area with thinners to remove oils and the beeswax and then wash the lead with a slurry of baking soda to prevent bleed through down the road, before getting into priming. :cheers:
Absolutely.
Well, I just got off the phone with PPG as an added safety measure. They said bonding with lead using DP40 is fine as long as the area leaded is meticulously cleansed and neutralized (I use baking soda and water to neutralize after lead work to kill the tinning acids) and of course wax/degreaser to eliminate any tallow traces from the paddles used to apply the lead. They said after all of that, use a 1:1:1 mix of denatured or isopropyl alcohol (90% minimum strength), ammonia, and water and to keep it in the lead area and not let it run all over other bare metal surfaces, then rinse with cool water, dry and apply epoxy.
Anything additional, I'm all ears...