Rust behind head-lights access?

What would be the best preventive measure to apply to this area of a Jimny which has not yet developed rust in that area (in order to prevent the rust from developing at all)?

Either an epoxy paint or as a minimum one of the wax type products.

Bosanek wrote: What would be the best preventive measure to apply to this area of a Jimny which has not yet developed rust in that area (in order to prevent the rust from developing at all)?

It seems to me that they rust from the inside out as the slam panel is not sealed.

Next to the engine mounts there's a drainage hole each side. I'd spray a bunch of wax in there

If they rot from the inside, then the application any rust protection material from the outside will mostly be in vain.

Spraying wax from those entry points near the engine mounts can definitely do no harm, but the question is if it is possible to properly reach those potential rot points from there.

Does it make sense to cut away some sections behind the head lamps in order to expose those inner rot crisis section in order to properly rust proof the area? However I suppose that leaving the section open would not be a wise idea in the long run.

Not on a Jimny but a land rover I drilled drain holes in various strategic places in the chassis to help get access to blind sections with a wax spray but also to allow water to escape. The rear cross members of defender chassis are notorious for rotting. Same principle as the behind headlight on a Jimny.

Epoxy paint then waxoyl inside....not wondering if it's festering now.