Check this out could be an interesting development. How about when your board finally beats the dust just stick it in the compost and watch this fungi eat it away. Could turn out that old surfboards might not be a persistant in the environment as we might have thought.
http://www.treehugger.com/natural-sciences/fungus-eats-polyurethane-found-ecuadorian-rainforest.html
God belss mother nature, now all we need is an insect that can digest old resin.