Thanks LL - sneaky! the magnets idea wouldn't work with the 2010 plastics - but some thoughtfully selected and carefully applied temporary glue would. I like where this is going …… Winter will soon be here in BC, Canada, so this might be a little cold weather, weekend project. Either doing the whole tank, with the 'blue and white' style pattern - but using my existing red as the base, with alpine white as the accent. Where would I buy that skinny black pin stripe for marking off the boundaries? Big box / auto store I guess? . Why the hell not?