Sand the surface down to 240 grit, and than apply a sealer to the surface. Once you scrape off the excess sap, use a cleaning solvent like mineral oil or turpentine to clean the rest of the sap off. Steps to remove sap from a wood deck:
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How to Remove Sap from Wood Cut The Wood
Heating the sap and getting it to ooze out of the wood is an easy way of getting rid of sap in smaller pieces of wood.
Apply 1/4 cup of saddle soap, or other oil soap, to the tree sap with a sponge.