Remove the top of a general-use pump sprayer or a garden sprayer and insert a funnel into the opening.
Protect your hands with rubber gloves and your eyes with safety goggles.
Carefully empty the contents of liquid wood sealant into the pump sprayer. The sealant should be rated for "below-grade" purposes.
Secure the top on the pump sprayer and prepare it for use as directed in the user manual.
Hold the wand of the sprayer 6 to 8 inches away from the wood surface and apply the sealant to the wood with long, overlapping strokes. Be sure to cover all surfaces of the wood that will be covered below grade with the sealant. Wait 24 hours for the wood sealant to dry before installing the wood.