subject: Tips for Installing Your New Kitchen Backsplash [print this page] The color of grout is entirely up to you, but once your tiles have been settypically after 24 hoursit's time to grout. Mix the grout to the manufacturer's specifications. Then, apply an ample amount of grout to work into the grout spaces of your kitchen backsplash. Using your grout float, make sure you clean the glass tile of excess grout. Then, finally, once the grout dries, buff and shine your new kitchen backsplash using a wet sponge.