I have 2 layered shaders used to texture my tank. They are all lamberts pluged into the layered shaders. The light is IBL with the RNL.hdri probe. In the IBL settings I have under visibility ; primary vis, vis in reflections, vis in refractions un checked. MR is set to the defult production settings with FG rays at 1000. I have I have attached a small quicktime file in a rar to better display my problem. Basiciall As the tank rotates the surface of my tank gets all messed up. Any help is appreciated.

Thanks for your time,
Kassun