I used to use the paraffin wax method, but I added micronized graphite rather than PTFE. It works well, but does make the wax look dirty. Nowadays, I find it too much faff to bother with the hot wax soaking and I just use commercial wax/dry lubes as I was ending up "topping up" the soaked wax chain with that anyway. I found that wax needed re-applying every 100-150km.