My understanding is that shellac and boiled linseed oil do not mix together. The oil acts only as a lubricant allowing the shellac on the pad to adhere to the wood evenly. Too much oil and it will either stay on top of the shellac or migrate to the top of the shellac coat at a later time. You want just enough oil that you can rub the shellac without the pad sticking as you move it across the wood. When the pad starts to move on the surface in a jerky manner, it's time for more shellac and another drop of oil.
If I'm incorrect, Austin can comment if he reads this.
Chuck
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