Hi from South Africa! With a couple of questions

[Violater]

Hello guys

Very informative website - I look forward to spending way too much time and money here - thank you very much!

I've got a gen Seiko kinetic, auto relay, which has treated me very well for the last 6 years, I would like to now start a small collection.


I've ordered this Tag Grand Carrera Pendulum Hand Wind watch from prestige and have got a couple of questions whilst I wait for it to arrive.
I've scoured the different threads and have found most of the answers to my basic questions, but some answers I haven't been able to find:
What are "ar crystals" and "PVD/DLC" coating?

With this hand wind watch, I understand this movement should give me about a 40 hour power reserve, does that mean that I should wait for it to run out, or can I wind it, say, every morning when I get up?
Also, does it matter in which direction I should wind it?

Then on to the subject of waterproofing, I've read Gloarmani's excellent post, WRT this watch,

will it be as simple as removing the back panel and applying some silicon grease to it and the crown, or are there a couple of things I'm missing?