To repair the existing holster is "possible", Not feasible. True, the cracks can be welded and then to do a professional looking job, it needs to be textured (yes there are surface molds just for this). The underlying issue is apparently a lot of flexing in this/your application. My honest opinion is that considering all, you should either 1) Consider this as short lifespan item and budget accordingly. Or, 2) switch to leather.