FYI I am not like a pro magician, I just like to F with my friends and keep them thinking

Anyway a few questions.
A) I been working a bit with invisable strings and elastics but I am having a really hard time tieing the elastic in a (I cant remember the english word here) but in a ring, like to have around my arm so I can slide it up over my hand when it's time to move a beer capsle or whatever. Is there any good tips on how to tie the elastics in a ring (tie on end of elastic to the other foring a ring).
B) I baught some skin colourd vax but I guess it's made for Golum or something, since it's much grayer than my skin

Do anyone know of a more white skin colourd vax and where I can buy it? (with dilivery in Europe)
C) What is in your opinion the best brand of invisable elastics and thread where can it be baught?
This is the stuff i got now.

and for string I got some

Is this the best choices?
Any help and tips wuld be much apreciated.