Green sand options?
Did a few casts to get short rods for the lathe work and noticed a big problem.
I used washed play sand as itwas the finest sand I could find locally.
The result was good in shape but very bad in terms of surface quality.
For another test I used the leftovers of my crushed perlite and mixed it bentonite and the surface was really smooth - but using perlite is not really an option.
Real green sand is hard to get in my area and the postage costs for a 20kg bag are just too high on top of it.
So, before I start hunting down all sand and soils shops nearby: Is there a proper name for extreme fine sand or a good alternative for a reusable casting media?