The Medway Handyman wrote:
http://pointmaster.co.uk/index.html

Seems like the answer to a maidens prayer - if it works :-)

The gun (similar to a normal silicone gun) is a better applicator.

The mix needs to be light, as in more plasticiser than water, otherwise you
end up with a cartridge full of cementy water.

Oh and the last bit in each cartridge needs to be got rid of as it's usually
devoid of any moisture and won't go through the nozzle if re-applied.

Once the mortar is in the joint, it has to be left to dry out somewhat
before using any kind of smoothing tool, this can take up to 2 hours
depending on the weather.