For starters this is not green-wood.
I have been cutting up some 2x4 into small blocks for painting and decoration. The block were cut and then sanded. About 3 days later I had the time to paint them. Today I noticed that some sap has seeped through.
The wood was not fresh (it was from a pallet fyi.) but the cuts opened up some sections of pith it would seem.
Is there anything different I could have done to have either forced the sap out or a better sealant before I painted.