Having heard a few positive things said about the Stone Texture paste from Acrylicos Vallejo, I ordered a pot of the Dark Earth shade from Minibits.
It was £7 for the tub, a bit more than I am used to paying for my basing material. I normally get a tub of house hold filler from my local Pound Shop and once every five years or so I beg a jar of sand from whichever friend, or neighbour, is having house improvements done.
First impressions are of a well hydrated, gritty 'paste' that is easy to spread out. I wasn't overly fond of the colour, as it doesn't remind me of any soil that I've ever dug (trust me, I taught pedology for twenty years). I'll be painting it when I use it.
The "micro particles", as Vallejo call them, are uniform in size. I would have preferred some variation.
I used it on a bunch of figures on slotta bases. It smoothed out nicely, although the brush I used had to be thoroughly cleaned every four or five figures, as it got clogged with the micro particles and took on an unhelpful shape.
One test that I tried was to see how well it would hide the step caused by a figure base, so I used it on the recently prepped Piggies. Immediately after application I put some grit on to add some variation.
Much as anticipated, the high water content led to quite a bit of shrinkage when it dried. It will need a second application. With my household filler I wouldn't need to do that. Ho hum.