Synchronize different prefab material over the network?

I am currently running into the following noob question while using the uNet-networking system: I have a player model prefab which is setup all right and I have a material selection menu where the players can choose their favorite color, let's say REDmetal or BLUEmetal and a default GREENmetal. I get it so far that the local player works fine. everyone chooses his/her material and sees his own player in the right color in the network scene, BUT ALL THE OTHER PLAYERS REMAIN THE DEFAULT GREENmetal... I have tried [SyncVar] and [Command], [ClientRpc]-stuff, but nothing really helpes. The material is never synchronized for the view of other players.

I am really new to networking and struggling since days. Hope for help here :)

 [SerializeField]
 private Material ShipMat_one;
 [SerializeField]
 private Material ShipMat_two;
 [SerializeField]
 private Material ShipMat_three;
 [SerializeField]
 private Material ShipMat_four;
 [SerializeField]
 private Material ShipMat_enemy;

 [SerializeField]
 private Material WingMat_one;
 [SerializeField]
 private Material WingMat_two;
 [SerializeField]
 private Material WingMat_three;
 [SerializeField]
 private Material WingMat_four;
 [SerializeField]
 private Material WingMat_enemy;
 [SyncVar]
 public GameObject Ship;
 [SyncVar]
 public GameObject Wings;

 void Update()
 {
     ApplyMaterial ();
 }

 void ApplyMaterial()
 {
     if (isLocalPlayer) 
     {
         if (CharacterSelecter.selectionIndex == 0) 
         {
             Ship.GetComponent<Renderer> ().material = ShipMat_one;
             Wings.GetComponent<Renderer> ().material = WingMat_one;
         }
         if (CharacterSelecter.selectionIndex == 1) 
         {
             Ship.GetComponent<Renderer> ().material = ShipMat_two;
             Wings.GetComponent<Renderer> ().material = WingMat_two;
         }
         if (CharacterSelecter.selectionIndex == 2) 
         {
             Ship.GetComponent<Renderer> ().material = ShipMat_three;
             Wings.GetComponent<Renderer> ().material = WingMat_three;
         }
         if (CharacterSelecter.selectionIndex == 3) 
         {
             Ship.GetComponent<Renderer> ().material= ShipMat_four;
             Wings.GetComponent<Renderer> ().material = WingMat_four;
         }

     }
     //this is just a possible solution for a default enemy-material
     /*
     if (!isLocalPlayer) 
     {
         Ship.GetComponent<Renderer> ().material = ShipMat_enemy;
         Wings.GetComponent<Renderer> ().material = WingMat_enemy;
     }*/
 }

}