Cocos3d Changing face color

Question

I am trying to change the color of the face on a CC3MeshNode. I am retrieving the selected face data with the below code.

CC3MeshNode*node = (CC3MeshNode*)aNode;
CC3MeshIntersection myMeshIntersection[kMeshHitCountMax];
CC3Ray touchRay = [self.activeCamera unprojectPoint:touchPoint];
CC3Ray localRay = [aNode.globalTransformMatrixInverted transformRay:touchRay];

[node findFirst:kMeshHitCountMax intersections:myMeshIntersection ofLocalRay:localRay acceptBackFaces:NO acceptBehindRay:NO];

CC3FaceIndices indices = [node faceIndicesAt:myMeshIntersection[0].faceIndex];

Ive tried to change the VertexColor but it doesn't change anything.

ccColor4F color = ccc4f(255, 0, 0, 255);
for (int i = 0; i < 3; i++) {
    [node setVertexColor4F:color at:indices.vertices[i]];
}

Nothing happens.

Actually, I changed the vertex color on a object in Maya and I didn't get what I was looking for. I'm actually not sure if changing the VertexColor would be what I should be doing. I want to achieve something like this:

I'm new to the whole 3d thing, can someone shine a light on a solution?

-Thanks for your time. :)

EDIT

I got the above code working, I was just forgetting to update the Buffers

[node updateGLBuffers];

but it wasn't what I was going after.

Can someone point me in the general direction of what to look up so that I highlight the selected face?