I use it all the time. It has a different look when its done and ashes, kinda white powdery,gotta watch it if its windy, it can (the ashes) float around a bit.It dries pretty quick too if you can keep it out of the rain/snow.
Thanks for all the advise guys. Im going to take a look at the links smoking365 sent(thanks for the links) to educate myself more. I also just found out my wifes grandmother has a grapefruit and lemon tree. looks like ill be doing some pruning.