I'm using graphite/epoxy on the bottom panels of a SW 17 Hybrid. The graphite can says to use a 1:10 ratio of graphite to epoxy, by volume. So, for 4 oz resin, 2 oz hardener, I use 0.6 oz (about 1.8 tsp) graphite. I've put on one coat so far, but it's not very black yet. Is my ratio correct? If so, any guess as to how many coats it will take? Does it end up being a flat black?