I watched my friend wipe off his plane today at the field and he wound up with a colored towel.
He explained that the covering was from Germany and they didn't use nitro in their fuel. I suppose the Nitro is the agent that removes the color.
I have just completed my Cap 232. it's covering is beautiful (Vmar ARF) i think this covering was from Germany. Do I have a problem if I use 15% nitro fuel?????????????