i found this yesterday, all you have to do is answer some easy questions (which they practically give you the answers for), and then you can get your free wax!
http://www.nikwax.co.uk/en-gb/webquiz/index.php
it worked for me, so i hope it works for you!
http://www.nikwax.co.uk/en-gb/webquiz/index.php
it worked for me, so i hope it works for you!