Yes, you can use watercolor ground on wood. This can be a great way to add color and interest to your project. Watercolor ground is a type of paint that is specially formulated to be used on non-porous surfaces like glass or metal. It is also made to be used with watercolors. When using watercolor ground on wood, you will need to sand the surface first to create a smooth base for the paint. Once the surface is prepared, you can begin painting. Be sure to use a light touch when applying the paint, as it can easily become streaky. Work in small sections and build up the color gradually for best results.