Using Physan

[kmccormic]

Hi Guys:
I have a plant which I think may have something going on, my local orchid club suggested Physan. I know you dilute it and spray it on, how heavily do you spray? Use a mister spraycan, or more like spray so you can see drops on it? Is this the one time it's ok to get water in a crown or where a leaf joins a shaft? How often is the max you would use it- every time you water? Should I add it to the water every time I water in addition to spraying? Thanks for helping a newbie out!
Cheers,
Kara