Can anyone tell me how to animate a color change on an object drawn using the Write-On effect? The shape is drawn in blue, but once the shape is completed I need it to turn grey.
You have color value in the write on effect that can be keyframed. Set it to blue and at the end of the completion create a keyframe. Advance in time how you like and set it to grey and this will create another keyframe. If you don't want interpolation between the keyframes then set both keyframes to a hold keyframe (ctrl/cmd+alt/option and clicking on the keyframes). if it's not what you need, please provide more information on what exactly do you want to accomplish.