Hi Brian. If you are going to use water stain it is best to raise the grain and sand before applying any stain. When you have completed your project sand starting with 150 grit then 240 grit. Wipe over with a damp rag and allow to dry, this will raise the grain. Sand again with 240 grit, wipe over again with a damp rag and repeat this until the grain does not rise with the damp rag. Depending on the timber used you may have to repeat the process four or five times. For the final sand you could go down to 400 grit but this should not really be necessary. After this you can apply your stain and then the finish of your choice.