Question
I understand the difference between the two but have difficulty buying wetting agents locally. Can I use spreader stickers to preparre peatmoss sphagnum ?

Answer
you would need to read the label on a container of the product to be sure on that one.  when in doubt i would always call my pesticide dealer(helena chemical co) and ask them info on particular products.  i'm not sure what you are using the sphagnum for.  sphagnum peatmoss should be used as a decorative top coating.  it shouldn't be incorporated into mixes.
good luck
rick