Fastone,
Those pockets are made of two different materials. The shiny bottom part, known as the "boot" is made of a flexible plastic that is very sensitive to super glue. If you find a crack in one of your boots, remove any debris, apply super-glue liberally enough so it doesn't run all over the place, accurately align the two sides of the crack and hold them together firmly for a minute or so. Be careful, the slightest contact with skin on the glued plastic will bond almost immediately. The upper "liner" is made of a rubber and plastic composite. The upper flange that rests on the castings can be polished. Jewelers rouge and a soft cotton buffing wheel will work well, but you must work slowly and lightly to avoid burning the rubber composite. Super glue is a very effective bonding agent on the composite material, too. If you get a "run" of glue as it dries, it can be cleaned up with 200+ grit wet-or-dry paper and lightly buffed by hand.