Best rust converter type product?

What would be the best way to stop rust in a seam. I've discovered a bit of rust on the tailgate of my wifes 2003 Dakota where the outer skin wraps around to the inner panel.(like on a door skin)
I wire wheeled it, coated it with some etching prime with my airbrush, then hit it with some rattle can paint that matched pretty well (silver)
Now just a few weeks later today I noticed a bit of rust stains starting again at the seam. So I guess its coming from the inside out.

There are a few slots that would allow me to pour some sort of rust converter/killer in there just not sure what to use that'll work

Any advice or tips appreciated............thanks

I'm afraid I have bad news. You have moisture and rust somehwere in the tailgate interior, not just the seam where you tried to treat / stop it. I'd say it's doubful you will be able to kill this short of opening up the panel.

You might slow it down though if you can figure out where and how moisture is getting into the tailgate interior? A bad gasket around a lock or latch?

If you can get into the gate interior, hose the inside of the tailgate down with some rust conversion compound, let it dry for a few days and then hose the interior down with light oil. A good freind of mine used to take his drain oil, mix it with kerosene and spray it into the interior of his Chebby pickup truck doors every fall to keep the bottoms from rotting out!

Astrobuf

I will also add that rattle can paint is not a catalyst paint and will not properly seal out moisture for very long. You'll need a two-part paint with a hardener.

But if rust is underneath, it will not stop...

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If you can get into the gate interior, hose the inside of the tailgate down with some rust conversion compound, let it dry for a few days and then hose the interior down with light oil.

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Astrobuf, thanks. I can get inside there a bit via a few small slots along the bottom of the tailgate. I've changed the title of the post now hoping for recommendations on a rust converter.

Afterward pouring oil in there sounds good to me, I'd think that'd slow it down

Kind of dissapointed a 03' is starting to rust like this. just trying to keep it looking good for as long as possible.

BossRide, I hear you on the rattle can paint, it was sort of a quick fix for the time I had. It does look like its coming thru again at the seam sadly. Guess I'll have to hit the paint store and get some real paint for this one too as it looks like I'm going to be fighting a on-going battle here.

Thanks again for the advice