Thanks Wal,
I have an old minelab goldseeker I find good on the beach, unfortunatly I split the caseing as it is breaking down with age.
I cant get a newer coil so I thought I would look into the possibility of rewinding or making a new coil that would be more stable and water proof in salt conditions. Or repacking the coil in a new caseing with the addition of a salt noise reducing layer as follows.
I noticed that some coils have a sprayed on carbon or ferrite? coating, do you know how this is done or what can be used?