In article
,
Kevin writes
There's large gaps behind the black granite upstands where the walls
aren't straight.
Ideal solution is to reskim the wall to level it off, but this isn't
going to happen. We've decided best compromise is to use some black
filler, but I'm not sure if black caulk exists and I'm a little wary
of using silicone.

You can certainly get black acrylic sealants which will probably be
tougher and less slimy than silicone, and paintable if that was what you
were worried about.

See:
http://www.toolstation.com/shop/p85374
--
fred
BBC3, ITV2/3/4, channels going to the DOGs