Breaking spokes

[Johan Bornman]

i noticed that if you only have one layer of tubless tape the pressure forces the sealant through the tape and then what i can only guess is amonia (from smell) eats the aluminium nipples which then go now i put double tape and replaced all my nipples same time should be good for a while

You are right about the sealant destroying the nipples from the inside. It is very common. Even worse, when sealant leaks into a Mavic wheel such as the Crossmark type where the nipples screw into the rim (not onto the spokes), you have a catastrophe of note.