I'm assuming it's just like Colorista or any other plug-in within FCP. You client would have to have the plug-in in order to see anything if you gave them the project file.
Otherwise you'll give them a self contained movie of the final grade. If you do a LOT of color grading for this client, it would be worth it for them to get the plug-in as well so they can make fine adjustments on their end if they want to, or you can simply change one shot and send them the new timeline or even the new filter setting.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author, Chef.
HD Post and Production
Biscardi Creative Media
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