Talc is not recommended from what I've read, although used by some people. Some one guessed it water adsorbs in the talc. I have a white sheet on faring material from my NA and what he uses. I suppose chalk would work but that seems messy. The pencil is pretty easy and works well for me and does not make a mess. I cut it with a safety blade and expose about 3/8 of the tip and only have to sharpen it once while marking out the hull pretty easy and simple no mess. It would seem the chalk would move around as you sand. You could use glass balloons or bubbles not sure about the load surface or water absorption. I like the bond that the bog with 407 gives and it not that bad to sand. I like the West Products because they have cans of different powders that I can easily grab for specific bogs. I know that they work with West have a proven track record.

Besides the exact materials used and method at least this gives you an idea of how I bog and fare out a surface. From here you can use materials that you feel comfortable working with and develop your own method.

No matter what it’s 1/7 material 6/7 elbow grease!
Sand with a smile!