5 years and a full set of Naniwas and no sealing , with not a problem a one,, I do like Glen, soak for a few while using the preceding stone, set down for a few minutes so any thing that needs to normalizes, then my DMT for 3-4 figure 8,s to some slurry going then get after it. like I said no problems, and my 5k and the 8k snow white shoed those spider webs or crazing, yet has had no effect on its ability to hone smoothly. Tc