Like any stains or dyes, from what ive read up on. Prepare the timber first, in that, not using wood grain fillers but to eliminate any faults or seen faults without sanding too far, ie. into veneers so that you sand through the surface. My understanding is once you have prepped the timber, to use the dye, to embed the color, allow to dry and coat again to deepen or accent the color till desired bland is reached. Using the Stain is a secondary process or as mention wood grain filler in the same color as the dye. Then light surface sand to remove anything sitting up, smoothing the grain down. This depends on what effect you want such as raised grain timber look or a smooth polished finish. Dyes are used to create stains so the dyes are the basis.