Don't be cheap and just "dab" the stuff in with a match stick of some oversize brush. Do it right with a size "0" paint brush (found at your local arts and craft store, get the white hair brush) and put it on in layers.
I had a detailer try to tough up a rock chip and he just put a big blob in the chip(1mm) and it looked stupid.
On my next chip (1.5mm size) I just took about an hour and layered in the paint with a size "0" paint brush. Put a layer on, wait for it to cure in the sun, then put the next layer and so on.... This will help you get the right texture and you can also add specs of different paint to get the right color matching.
Yes I know this is a long process but it looks great when you are done.
As for your car, Metalic silver is very tough to match, I would recommend getting some extra bottles of silver, grey, white, and metalic silver from a hoppy shop to see if you can mix in the righ combonation of colors to match yours, since I'm sure its been weathered by the sun.
I was lucky, my car is black
