Retrictions on Painting A Beyblade

Are there any tournament or any other regulations on the painting the top of your beyblades? I mean like the top, not spray painted like miniature brushed on painted. Thanks!
Yes, you can read our rules on paint and foreign substances here: https://drive.google.com/drive/u/0/folde...XJtUXJ1SmM (It was accessible under More - Rules & Resources in the header.)