i always have this saying when it comes to haunt makeup: you get what you pay for. wal-mart's blood is not the best, as its cheap. its only meant for costume, mearly a dye.
i have used these before, and they do quite well. for a more wet look, look for blood gel, which stays sticky and wet looking for a while. I myself though love dried blood, because once you add more to your costume, it just adds the distrubing factor to it.