TS01, The Maplus Race Bases are hydrocarbon/paraffin or HC/paraffin with graphite.
I was just thinking the Maplus RB Hard, but a down side of using the graphite doesn't come to mind. A trick for applying very hard solids is hot touching/crayoning for a very thin layer to reduce scraping and brushing. If you do get over zealous, you can soak up any excess with a shop towel or fiberlene between iron and base. I ended up using a metal scraper and metal brush, last time I use the stuff.
Hey comprex, did you get any RB Soft? I thought a fun experiment would be to blend the RB soft & hard to see how it compared to the medium and lean it one way or the other depending on temperature. I'm liking the soft for initial saturation (followed with med) and spring. The med is my hands down favorite. Worked great today.