Waterproofing is not necessary for calf leather. If you use saphir rejuventor (contains beeswax and mink oil with waterproofing property) and cream polish (pigment and nutrient), it should be sufficient.
Of course having said that, regular polishing will help to keep the leather more lasting vs unattended care at all....
Suede is recommend to be used with waterproofing spray. For my own experience, spray them once a month should be sufficient. You doesn't need to spray them everytime you go out. And suede is less durable than leather is a myth. See the article by theshoesnob.
http://www.theshoesnobblog.com/2010/04/suede-shoes-big-misconception.html
For me I will just wear them as if leather leather shoe and ensure that there is a proper suede cleaning session if I really get caught in the rain.