Thanks!
i don't use any fancy products lol, I do my main color and clearcoat it with duplicolor auto clear to seal it.
for the chipping I mix black and brown craft paint and just dab in on pretty much covering the whole thing.
then I use a damp q-tip and go about removing the craft paint in a random fashion to make all my chipping, I do go in and outline a few of the larger chips with a lighter shade of the base color.
then I clearcoat it again, (all gloss automotive clear btw)
next I do my oil weathering to make dusty and grimy areas and shadows, I don't thin them just use them out of the tube, apply some in the areas and then blend out with a soft brush, I also remove some of it with a q-tip to vary the color then again I clearcoat it, i don't even wait for the oil to dry.
then I use white artist oil and drybrush everything very lightly with it, then I clearcoat it, this time with a dullcote
last thing I do is go in with black artist oil mixed to a thin wash and apply with a pointy thin brush to bring out other details.