Quick Answer
Tarred bankline can last for many years when properly made and stored, but UV exposure and water absorption from rain or immersion can lead to degradation.
Bankline Tar Composition
Bankline tar is a natural, waterproof adhesive made from pine tar, rosin, and other plant-based materials. It has been used for centuries to protect cordage from water and UV damage. A typical bankline tar recipe includes 1 part pine tar to 1.5 parts rosin, mixed with a small amount of beeswax to help it stick to the cord.
UV Resistance
While bankline tar itself does not provide UV protection, it creates a barrier that prevents water from penetrating the cord and causing damage from within. This makes it more resistant to UV degradation than an unprotected cord. However, prolonged exposure to direct sunlight or high UV index environments can still cause the tar to break down over time.
Maintenance and Storage
To extend the lifespan of tarred bankline, it’s essential to store it in a dry, shaded area or a waterproof container when not in use. Regular inspections should be performed for signs of damage or wear, and minor repairs can be made using additional tar and cordage. In extreme environments, consider applying a UV-resistant coating or wrapping the bankline in a protective material to provide additional protection.
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