So the idea is ketchup, what gets harder or sloppier ?
I can't really see the benefit to it getting sloppier as it's pretty sloppy to start with.
And yeah the rusty balls work well.
You need quite a lot of balloons and they need to be tight for it to maintain shape when throwing.
But until the balloons rot from natural uv exposure, they last for a really long time.
Of course if you leave then on a shelf for a couple of years untouched, they will fall apart and scatter sand everywhere when you find them again and pick them up - allegedly
And you can always replace the outer two balloons when wear or rot starts to show.
The really fine sand they sell for kids sandpits is the stuff you want.
Easy to find and pretty cheap.
I would also like to point out that Jaegoor has 'farmers' hands.
Basically hardened machine tools - on the ends of his arms.
Got a grip like a pneumatic pincer.
So just because he can shape them by hand - doesn't mean you'll be able to lol