Mr Morlock wrote:Its easy- you take a sample and the paint code to the professional paint supplier and they will supply you with what you want.
I'd do what mr morlock does.
My paint supplier charges me about $10 for 100ml (I'm a regular there)
Unfortunately for you op, light metallics are the hardest of all to match with a brush. Metallic silver paints are aluminum chips set in clear with a few tinters, such as a bit of black.
When spraying silver, if you paint wet coats it will be darker than if you paint dry coats. This is because on the wet coat the chips sink and settle a bit before the paint dries.
Brush touch-ups have a relatively long drying time, so touch-ups on silver often look darker.
If this happens for you let the paint settle for a few days, and then scoop a bit of the settled chips from the bottom of the can and wipe it inside the lid. Use this to lighten the touch-up colour as required.
Oh, and buy some acrylic thinners.