The best way to build cake is to smoke it. If you want to add a little help for the first couple smokes, line the chamber walls with a 3:1 mixture of honey to water. Pack and smoke your pipe as usual. When your done, put a thumb over the chamber opening and shake the ash around. Empty the pipe and clean.
I would recommend doing this twice, with 3-4 bowls between the first and second round.
It won't add a thick layer of cake, but it will help prep the walls to build cake.