Boiled linseed oil is partially polymerized so that it becomes a "drying
oil", meaning that it will cure or harden in the presence of oxygen. Raw
linseed is a non-drying oil, and just turns gummy.
The unboiled stuff is less common (and more difficult to find in
stores). It is very good for applying to outdoor projects that you
don't come in contact with, such as fences, trellises, retaining
walls, etc. The unboiled oil lasts much longer than the boiled.
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