trim around a bathtub

[gorotsuki69]

I have a gap between the wall tiles and bathtub that is too large for grout . I am thinking of using a concave trim such as the one below

http://www.infotile.com.au/bat/trims/trim-7.html

Is this a good idea around a bathtub?
where can I buy such a trim in Perth?
A few tiling shops I checked don't stock them

thanks