If you are into the eco-friendly movement, consider using 'walnut shell' media in your application. Go to www.ecoshell.com ... the MSDS is on the website. It is manufactured in over 30 grit/mesh sizes, as fine as -100,-200, and -325; we will send you a sample kit of the different most common mesh sizes used. Then you can choose a size you would like to trial in your application and we can send that to you ..so you can see how it actually is a better product and cost-effective than sand.