It's always worked well for me as it dries rock solid and also means I can go out wearing nail varnish to match my car. Obviously doesn't have the same effect if you're male
If you open your tailgate and look up, there should be a silver label attached to it next to the lock. The label gives details of your colour name and the paint code. Take the code to Halfords and they will make you up a can of paint or an aerosol spray. Takes about 10 minutes and costs £10. Use a fine paint brush to fill up the chips.