GC-Dental. GC Fuji IX GP Fast Caps. GC Fuji IX GP Fast Caps. Normal and Fast-Setting Packable Glass Ionomer Restorative The packable non-sticky consistency of Fuji IX GP makes it ideal to be used in Class V, I & II restorations, as base or as core build-up material. The genuine glass ionomer properties, in combination with the ease of use, ensure that Fuji IX GP can meet all your demands on modern restorative materials.