robgraham wrote in message ...

I've tried using empty cartridges for such things as cement when pointing
between slabs. Seemed the ideal thing. However, I found that you cannot
push
wet cement through a nozzle. It just firms up like sand on the seashore
does
when you tread on it. So maybe this is what happens to Polyfilla.
IME it happens to anything with a lot of aggregate. Mastics and the like
have a creamy consistency and are the only things suitable for a cartridge.
To me the Screwfix cartridge is a non-starter. Anything you can easily load
into it will suffer from the above and anything that would actually work
would be impossible to load into it.