I accidentally tried microfragging - I was trying to remove a frag I bought from the plug and it broke in three pieces. I spread the pieces out on a new plug, and I really think it covered the plug much more quickly than the one larger piece would have. It makes sense - most of the growth (for encrusting) occurs at the edges, so instead of having a large center portion that's not doing anything, you have a bunch of pieces that are mostly growing edges.