I had a what sounds like an very similar chip in the raised portion of my driver's door. While the Audi touch-up sticks are not great they work OK if you are patient enough to commit to a 2 to 3 week process. Clean the chip, apply a very very thin layer of paint from the stick, and leave it alone for a couple of days to dry/cure (OK to use the car). Repeat the process until you've almost filled the chip. Very carefully even(only) the applied paint with something like a 3M Microfine finishing sanding foam pad, and apply a couple of coats of the clear stick over a few days. Micro sand the last coat after a few days, and use a fine polishing compound to blend it into to rest of the door. Wax, and you are good to go....hopefully.
If your paint won't dry, it sounds like you are not mixing the componnets in the tube by shaking it long enough, applying it way to thickly, or the ambient temperature is way too cold. Touch up isn't a one step process, if the paint doesn't dry between applications, or if you apply it too thick, it will shrink inside the chip when it does dry.
Good luck, the alternative is to repaint your door, blending into the adjoining panels(expensive). Some (very few) professional detailers/paint shops can accelerate the chip repair process using heat lamps.
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