The quality Dichroic surface is stronger than the glass that it has been placed onto. The final layer that we adhere to the glass is Quartz Crystal (This material is almost as strong as an actual diamond). But, because it is so extremely thin, if something can scratch the glass, it will usually also scratch the coating. We do not recommend using abrasives such as steel wool, etc. Also, when grinding the edge of the glass, the coating will chip off along with the glass that is also being chipped off. We recommend using a fine grit grinding wheel when trying to keep chipping to a minimum.