is the chip right on the door edge? in other words, it's not so big that the door panel itself has damage, right? kumbaga yung door edge tumama sa pader tapos nag-chip?

if so, here's an old bodyshop trick: simply get the touch up paint (or similar color) from a dealer or paint shop (if possible make sure they thin it out so it's more thin like nail polish and not thick like house paint).

take a pipe cleaner or cotton bud, dip it in the paint, and then run it along the edge of the door. it should cover it up nicely. i wouldn't bother with rust preventer. sayang naman pinturahan yung buong pinto for a 2mm chip.

btw, don't wax anything if you plan to paint. those two don't mix like oil and water