Preparation is necessary just like when you prepare the wood before staining and sealing. You need to ensure that the surface of the wood is treatment-free and bare, and that any stains or sealants have been removed before beginning with any aging process. You also want to open the grain, which will allow more of the solution to be absorbed and thus provide an even finish. This can be achieved by sanding the wood. The first step is always to ensure that your work area is prepared so that you do not damage any surfaces when working.