Rocker panel minor rust repair

[85Ram50]

It looks like the rust converted to iron oxide to me. That is the black color. And it looks like he's cleaned it up to get rid of the loose rust. My experience is that if it is dry, degreased and he seals it that spot won't rust again.
If you get rust in the area again it means you left active rust behind.

[MrPaco]

It looks like the rust converted to iron oxide to me. That is the black color. And it looks like he's cleaned it up to get rid of the loose rust. My experience is that if it is dry, degreased and he seals it that spot won't rust again.
If you get rust in the area again it means you left active rust behind.

What would you use to seal it? just primer/paint?
I thought that's what I did last time, but you're probably right and there was still some active rust left. What was the name of product you used on the bed of your truck to neutralize? The product I used (loctite neutralizer) said that if painted over it must be with oil based primer/paint, but I'm not sure if what I used was oil based, so that could be the issue. The paint I used was this https://www.automotivetouchup.com and I couldn't find any info on the product or the website about it being oil or water based, I even contacted the company but no response.