Easycraft has available flat and rebated dado rails to finish the top of 900mm dado panels or to cover visible joins and gaps. See the easyDado product page for more details.
For some finishing options & suggestions please consult Easycraft’s recommended trimmings. Additionally, for some other finishing ideas you can refer to the BATEX range of Trims. Refer their range of TILE trims suited for 9mm thickness. Follow the link to their website and State Office Contact details.