I am not sure to be honest but it's worth a try!
Egg shells used as a mulch around your plants will stop snails and slugs.... they hate crossing anything sharp. Thankfully they are not a huge problem where I live :-)
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I've heard that about eggshells although I see these little fuckers slime trails on the sides of the cacti, right over the thorns! I'll do a trial in one pot that is a particular favourite
I have heard snail slime on a wounded cacti can cause some interesting mutations :-)
Let me know if it works.