the “paste” or hard debris can become a problem when it is not flushed out and embeds itself into the surface of the softer matrix.
This a problem with Vesconite and Devol. I install grease seals top and bottom of axle tube to reduce this harmful grit/paste. It works to a degree I think. Also the Gaiter's are a help. But I can find some damage to My Hard Chromed KP's if I look thru a magnifying glass. Where You live and drive is also an issue. Texas, not good. Western Washington, better still not really good. Eastern Washington and Oregon, terrible!