This version of the Kling-on Top Protector is the Ultra product and is thicker than the regular Kling-on product. It is thick enough for golpes and tapping. While I have not had this exact version on for long, I have had the other lighter version on three other guitars for several years and have had no problems with French polished finishes, relatively new ( several months) or much older. A good product when you want some protection without modifying the sound board. Especially important on the softer Cedar tops