Mike asked;

If I may ask, when applying the sealant, what is the best way to smooth
the
sealant? I've been told a finger will do, but I always find this messy
and
doesn't give a very good finish. Is there a tool or something that I
could
use instead, and where would I get such a tool?

There is! Vitrex Sealant Smoother http://tinyurl.com/cb59t

Dave