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To ensure that you're purchasing pure tung oil, look for the words "100% tung oil" printed somewhere on the container's packaging. You can find tung oil at a local paint store or hardware store. 1 quart (0.95L) of tung oil or Waterlox will cover about 15 feet (4.6m) of butcher block. If you'd rather apply a longer-lasting product than tung oil, you can seal the butcher block using a more substantial chemical sealant, like Waterlox. Both products are food-safe. Dip a clean, dry cotton cloth or rag into the container of tung oil or Waterlox. Then use the cloth to rub the sealant across the surface of the stained butcher block. Work in long, straight strokes that parallel the direction of the boards in the butcher block. Give the sealant a full 12 hours to dry. Sealing the butcher block is a time-consuming process. It will need several layers of tung oil or Waterlox. Use the same method for each layer: saturate a clean rag with sealant and then rub it along the surface of the butcher block. Use a clean cloth to remove any excess sealant. Ensure that each layer has at least 12 hours to dry before applying the subsequent layer. Avoid using the counter for 7 full days so the oil has enough time to fully soak into the wood. Once the week has passed, you can use your stained butcher block counters. You can still use your butcher block countertops before a full week passes. However, they'll be oily and may stain your dishes or clothes. Tung oil wears off eventually, at which time it needs to be replaced. Every 4 monthsor as soon as the surface of the butcher block begins to look fadedapply a layer of tung oil to the wood. The additional coats of oil won't take a full week to dry. To be on the safe side, though, give each layer 3-4 days before using the countertops.
Purchase 100% tung oil from a local paint store. Apply a layer of tung oil to seal the stained butcher block. Apply 4 additional layers of tung oil to the butcher block. Give the tung oil a full week to dry. Put on a new layer of tung oil every 4 months.