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Some people use a polishing compound after sanding. The compound has a fine abrasive that’ll remove any scratches left by the sandpaper. After rubbing, let the surface dry and buff the finish with a clean, dry cloth. Whether or not you want to take the extra step in using the polishing compound is up to you. Some people use a polishing compound after sanding. The compound has a fine abrasive that’ll remove any scratches left by the sandpaper. After rubbing, let the surface dry and buff the finish with a clean, dry cloth. Whether or not you want to take the extra step in using the polishing compound is up to you. === Final Thoughts === Some people recommend using a sealant between the final application of stain and the first application of polyurethane. I never felt it was necessary as I believe modern polyurethane is an effective sealant. Polyurethane combines the best properties of rubber and plastic serving to seal and protect the stained wood. When selecting a brush remember that bristles are better than foam. Disposable foam brushes are no substitute for real bristles when it comes to laying down a smooth coat of polyurethane finish. The only time I find a foam brush useful is using a small foam brush to get into corners that the staining rag cannot reach. Use a good quality brush and prep the brush before use. To avoid bristles in your finish, be sure to fan a new brush and pull out loose bristles prior to use. Cheap low quality brushes tend to lose bristles readily. Brushes intended for use with latex paint are not appropriate for the application of polyurethane. Get the right brush for the job.