Choose a high quality polisher for that and apply as described in the instructions. Please avoid to drag the chairs over the surface. If you want to move them make sure to lift them up. This way you will prevent them from becoming unstable. We also advise you to keep your chairs out of direct sunlight. All of the materials we use are of high quality and made to last for a long time. That’s why we offer you a guarantee on our products. Nevertheless taking good care of your furniture is essential and will expand its lifespan even longer.