In the past I have taken steel wool and saw dust to stuff up a bunch of pincushions that my girl scouts made for the senior center ladies. They cut circles of flannel to put the steel wool and saw dust in and placed them on top of a canning jar lid and filled the jar with thread, needles, etc.
I make and sell LOTS of pincushions. I just use regular sand. I sift it, wash it, and bake it in the oven at 450 to kill any bugs. I've never had a problem with my cushions. " My cost...FREE" My husband told me about the fine sandblasting sand, but it's to fine to use.
Looks like you got your answer! Congrats another question answered by your Cute friends.
Now I'm curious (never heard of sand inside a pincushion): Is that "normal sand" or special grains? Maybe I should try the sand from Felix sand-box for the next pincushion :o)
Greetings, Bettina
They are selling if by the pound