Just read this interesting article on a Nissan forum (No pictures though im afraid)
Might give it a try.
Fix those Stone chips
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we all get them, they're annoying, and Ive had my front bumper resprayed 4 times now because of them, and so here's a cheap solution, before you go any further though, its not as good as a reprayed bumper, but its not bad.
Tools you'll need:
Depending wether you're doing it on the car or not you'll need a few tools to take the bumper off, I took mine off to make it easier on my back.
touch up pen
patience
superglue
patience
wet and dry fine grade (1200 or higher)
patience
beer
patience
cutting polish(T-cut, autoglyms paint renovater, G3)
patience
polishing cloth's
patience
I well further stress the need for patience, I would say I have less than average amount of this, but when it comes to doing my car I have a lot, and I got seriuosly *bleep* at doing this.
before pictures:
Make sure the bumper is nice and clean, touch up using your touch up pen, for the deep holes use a dab superglue after you've put the paint in the hole, this acts as a thick laquar to smooth things out
(at this point I called it a day, and got drunk, leaving the paint and glue to fully dry overnight)
Allow to dry out, then using the wet and dry, fully soaked in really soapy water(I used 1 part water to 1 part washing liquid)and rub bumper where you've been touching up till its smooth(you have to keep dipping in the water)
this is what it'll look like when you're done:
Then rub off after its dried with a cloth, it'll now look like this:
Now that bit should of taken a while, this will take even longer, using the polish and the cloth's, rub like hell where its all dull, after time it will come up shiny and nice again, and here's the finished result: