Memorial Plaque for Bench, Custom Engraved memorial plaque Jewellers BrassJewellers Brass Memorial Plaque for Bench, Maintenance Free Memorial Plaque for Bench. This product needs no polishing because it has a hard epoxy lacquer applied to the surface of the material. These plaques will never tarnish or go dull over time. Should your plaque become dirty due to the weather, simply give it a wipe with a bit of soapy water. Never try to polish the plaque as you will wear away the lacquer.