agentg:
Check this out
http://www.armorama.com/modules.php?op=modload&name=SquawkBox&file=index&req=viewtopic&topic_id=174774&page=1
G
You know, if anyone ever criticizes the Finescale forums, take a look at this link---this was posted on April 20th; it is a masterful, stupendous example of pure Art, and he got 17 lousy replies! Sheesh!
Not only that, but no explanation whatsoever of his techniques or methods. FINESCALE MODELER FORUM RULES! Personally, I think he missed the amount of rusting it should have had on the surface, but I may be wrong; if he got it from a photo,, then he may have been dead-on?
Ok--now to address the post; I think you have to address and consider what you're going to use for water--is it going to be transparent? Translucent? Colored? How much should you tailor the finish to either compliment the material?
Celluclay would be the perfect material for sculpting barnacles, or even just random growths. Also, you could simply layer the sides with putty and rough it up before it cures to simulate sea growth or rampant rust decay.