How To Seal Wood Coasters. If you like the look of the wood as is, simply leave it alone and proceed to sealing. You can also wipe on a natural oil like tung oil or linseed oil with a soft cloth.

If you like the look of the wood as is, simply leave it alone and proceed to sealing. The first thing to consider before sealing your wood coasters is whether you want to apply a wood stain. Sanding the surface image source the next step is to sand the surface.