Replying to more tuning, a few waxing questions

I tried ouit waxing a ski for the first time today on an old pair. I think it turned out pretty good but not sure. How do I know when to stop scraping? when I get no more wax coming off? I had a ton of waste too. How much should I initially drip on? Whats the easiest way to reuse the waste?
I'm using dakine's iron, it was cheap and thats what the shop had. anybody know if its alright at staying at a good temp.?