Wait for him to come down, go with him to buy the paint as he should know how much to buy to paint your car. There is a paint dealer off of 41 that my paint guy uses. You can also see a sample of the paint in thier book.
I have a friend on the del sol boards who paints as well and he was amazed at how little of the flake he had to use for the granada black that is used on a 94 ex coupe.
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production