NCF Stone is designed to be used specifically with natural stone such as granite and marble, especially light-colored varieties of granite which are prone to discoloration when too much of our NCF Quick is applied. However, NCF Stone should still be applied as a light mist- if the parts are becoming visibly wet, you are applying too much. NCF Stone is recommended for all granite and marble but especially with light-colored stones that may discolor with NCF Quick. It is a more expensive product per ounce than NCF Quick, but it eliminates the worry about potential discoloration. There is no benefit to using this accelerator on stone types besides granite and marble, so NCF Quick is recommended for other stone types.