An abradable system comprising: a metallic substrate (12, 112, 212); an abradable coating (18, 118, 218) on the metallic substrate (12, 112, 212), the abradable coating (18, 118, 218) comprising: a plurality of abradable layers (22, 122, 222) including a first abradable layer (22, 122, 222) and a second abradable layer (22, 122, 222), and a plurality of CMAS resistant layers (20, 120, 220) including a first CMAS resistant layer (20, 120, 220) and a second CMAS resistant layer (20, 120, 220), wherein the plurality of abradable layers (22, 122, 222) are in an alternating arrangement with the plurality of CMAS resistant layers (20, 120, 220) such that the abradable coating (18, 118, 218) alternates between the first CMAS resistant layer (20, 120, 220), the first abradable layer (22, 122, 222), the second CMAS resistant layer (20, 120, 220), and the second abradable layer (22, 122, 222), in that order, on the metallic substrate (12, 112, 212), wherein the plurality of CMAS resistant layers (20, 120, 220) are configured to react with molten CMAS to form a phase which slows the infiltration of the molten CMAS through the plurality of CMAS resistant layers (20, 120, 220); and an opposing abrasive element (38, 150, 250) configured to abrade the abradable coating (18, 118, 218) to a maximum penetration depth (d) in the abradable coating (18, 118, 218) that includes abrading at least the first abradable layer (22, 122, 222), the second CMAS resistant layer (20, 120, 220), and the second abradable layer (22, 122, 222), and wherein the abradable coating (18, 118, 218) comprises at least one respective CMAS resistant layer (20, 120, 220) of the plurality of CMAS resistant layers (20, 120, 220) between the maximum penetration depth (d) and the metallic substrate (12, 112, 212). a metallic substrate (12, 112, 212); an abradable coating (18, 118, 218) on the metallic substrate (12, 112, 212), the abradable coating (18, 118, 218) comprising: a plurality of abradable layers (22, 122, 222) including a first abradable layer (22, 122, 222) and a second abradable layer (22, 122, 222), and a plurality of CMAS resistant layers (20, 120, 220) including a first CMAS resistant layer (20, 120, 220) and a second CMAS resistant layer (20, 120, 220), a plurality of abradable layers (22, 122, 222) including a first abradable layer (22, 122, 222) and a second abradable layer (22, 122, 222), and a plurality of CMAS resistant layers (20, 120, 220) including a first CMAS resistant layer (20, 120, 220) and a second CMAS resistant layer (20, 120, 220), wherein the plurality of abradable layers (22, 122, 222) are in an alternating arrangement with the plurality of CMAS resistant layers (20, 120, 220) such that the abradable coating (18, 118, 218) alternates between the first CMAS resistant layer (20, 120, 220), the first abradable layer (22, 122, 222), the second CMAS resistant layer (20, 120, 220), and the second abradable layer (22, 122, 222), in that order, on the metallic substrate (12, 112, 212), wherein the plurality of CMAS resistant layers (20, 120, 220) are configured to react with molten CMAS to form a phase which slows the infiltration of the molten CMAS through the plurality of CMAS resistant layers (20, 120, 220); and an opposing abrasive element (38, 150, 250) configured to abrade the abradable coating (18, 118, 218) to a maximum penetration depth (d) in the abradable coating (18, 118, 218) that includes abrading at least the first abradable layer (22, 122, 222), the second CMAS resistant layer (20, 120, 220), and the second abradable layer (22, 122, 222), and wherein the abradable coating (18, 118, 218) comprises at least one respective CMAS resistant layer (20, 120, 220) of the plurality of CMAS resistant layers (20, 120, 220) between the maximum penetration depth (d) and the metallic substrate (12, 112, 212).