You can use the sand from Lowes or Home Depot and mix your own. When you make a mold, only the sand that touches the pattern matters! Use a handful of our fine sand through the wriddle (sieve), only enough to cover the pattern. Then fill the rest of the mold with the coarse sand mix. The sand that touches the pattern is called "facing sand", it mixes in with the rest when you shake out the mold.