According to the manufacturer, the Chapin 81008A 80 - Pound Salt and Ice Melt Spreader can be used for fertilizers, but it is not recommended because it does not have the calibration to distribute product at the rate advised. Please look at the other Chapin Spreaders available on our site.
Chapin does not recommend sand be used in any of their spreaders, including the Chapin 81008A 80 - Pound Salt and Ice Melt Spreader.
The Chapin 81008A 80-Pound Sale and Ice Melt Spreader is really made for coarser materials rather than top dressing or mulch. You could potentially use a drop spreader or broadcast spreader that is made for granules, or you can simply pour the bags out and use a rake to disperse it.