There is a misconception about Double Boiled Linseed Oil benefits compared to alternative products made today. Rainforest Sealer is made with linseed but it's a much higher quality than double boiled. This is because the coating is made with good linseed oil and then it filters out the impurities that are food sources for mold and mildew. The oil is then refined so that it is more durable and dries faster without the need for certain toxic driers that were once common in double boiled linseed oil.
HEAT TREATMENT OF WOOD
Air Heat Treatment and Oil Heat Treatment are both great ways to increase durability of wood.