Waterproofing gap between bath and wall

There used to be a board that lay on the lip of the bathtub and went up the wall about a metre. It was covered with tiles and wasn't very attractive. So we got rid of the board and now there is a gap of about 1 cm. Is there a tile that will go over the bathtub lip and stop water getting in?

Here are some rough images to show you what I mean:
http://web.me.com/burnfield/Site/Bat..._bath_tub.html

Or maybe a better way? We've been told that we should keep and re-enamel the old bath tub (at $690) as it's difficult to get another new bathtub to fit exactly over the plug hole.

Suggestions are very welcome.

Cheers,

David


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