<font color='#000080'>You could try a waterproofing used for camping and boots etc., I'm sure that would do the job, but I don't know if it will let water throught the other way. I used to use G-Sport from my local Army/Navy surplus, you should be able to get something similar. Just sprays on.
WHy not e-mail the gusy at Weezle? THey must know what's best for it, may even send you something free!