Start of by removing any crumbs on your placemat. Make sure the placemat is dry before applying stones.
To apply the stones on your placemat, apply a generous amount of silicone to the stone and then place them onto your placemat one at a time. Start off by creating filling border around your placemat, then fill in the rest of your placemat.
Wait for the silicone to completely dry, then hand clean the placemat with soap and water.