Keep in mind that not all fonts work for all substrates, such as stone, clay pavers, or concrete pavers. Designs on a stone or paver require depth in the etch, and some of these surfaces are porous. Choosing a bold font ensures success on these types of surfaces. If great depth is required for granite etching, then it is best to add a stroke to those fonts that are not thick and bold.
-Liz Haas, Rayzist