I have been using a kit as a testbed for new techniques. This week I decided to apply the technique of mising some sort of powder with cyanocrylate as a filler. Somehow I remembered that the technique called for talcum powder. After applying it, with OK results, I then wondered if the technique actually called for baking soda.
So, in the great tradition of dumbass questions, which is it? Or is it both? And which, if both, gives the smoothest sanding result?