I'd bought some Vallejo white pumice a while back with the intention of using it for basing. Upon further research, many people find it to be too messy for basing. So I stuck to Gareson's method.
However, I felt like I shouldn't let the pumice go to waste and decided to give it a go on the earth berms of the fort section.
As expected, it was a bit of a nuisance. I used a wet craft stick too apply and it was hard to get it on evenly and without the odd bit poking up like meringue. I'm pretty pleased with the texture though.
Here's the back of it done. Have to admit this side is looking more like a concrete bunker than an earth berm, but hopefully some paint and flocking will sort that out...