If you buy a New sebenza from them, they are able to do colors. If you have an existing sebenza, you are limited to reverse contrast ( blasted scale and the machining will be shiney silver ) OR have a design and then have it blasted over. As far as full coverage, I am sure it's possible because you see Uniques with full coverage. Your best bet is to email Heather at CRK as she is the one who deals with the custom engraving end if it. She will show the machinist and get back to you with what is possible to do...!!