The recent article by Pease regarding the debate over bowl coatings got me thinking. While I am not a big fan of coated bowls, and will generally remove them from a new pipe before breaking it in, there is at least one instance where I have found them to be extremely useful. Namely, in the case of a pipe which displays the dreaded grey charred or soft spots which could, if left unattended long enough, result in the continued degradation of the chamber and eventual burn out. Many such pipes have passed through my hands.
Finding the oft-touted cigar ash “pipe mud” insufficiently smooth, strong, and easy to work with in fine applications such as treating, say, a small area of grey char in a chamber, I have found the following bowl coating method to work very well. I have used it with great success in pipes whose damaged chambers gave cause to worry.
The bowl coating itself is a paste made by mixing a small amount of full-fat yogurt or sour cream with the contents of fine black charcoal capsules (available at any health food store). Start with a very small amount of yogurt or sour cream and continue mixing in charcoal powder until it becomes jet black, then mix in some more charcoal, and even a little bit more for good measure. The goal is to produce a think, smooth paste in which as much charcoal particles are suspended as possible, without it being grainy. I typically let the mixture sit covered in the refrigerator overnight, then drain off any excess water and mix again. The paste should be very thick, yet very smooth.
Application is done with a small, flat glue/flux brush (available at any hardware store, usually in bags of ten or twenty; very inexpensive). Apply a very thin, consistent layer and allow to dry. When sufficiently dry, wipe out the bowl and then apply another very thin layer. I will typically repeat this process a number of times, with the goal being to fill-in the soft or low spots, cracks, or fissures so that the entire bowl surface is even. With careful smoking, the resulting coating left behind after the application/wiping process is then covered with a veneer of true cake, and voila, worry abated.
I have used this recipe numerous times with great success. The coating is innocuous, strong, and takes a natural cake very well.