Deft Defthane VOC Satin Clear Interior/Exterior Polyurethane, 1 Qt. Miracle-Gro A proprietary resin liquid is

A proprietary resin liquid is applied to the exposed face and soaks into the stone

Integrated dust blower

limited lifetime warranty

as well as an end of life timer that lets you know when it is time to replace the device

Deft Defthane VOC Satin Clear Interior/Exterior Polyurethane, 1 Qt. Miracle-Gro A proprietary resin liquid isAn interior exterior product that dries to a clear, tough finish with excellent resistance to wear and staining from water, alcohol, food, household chemicals, salt spray and exterior weathering. Flows out well to minimize brush marks. Use on unfinished and stained wood, painted, varnished, or lacquered surfaces. Protects metal from rust. Dries dust free in 30 minutes. Recoat in 6 hours. Covers 500 to 600 sq. ft. per gallon.