Cloversmilker, take a look at
http://www.brouwland.com/en/ and look for Diarying, other additives. I'm not sure they ship overseas, but it's the only webshop I know that is also in English and does sell this coating (however only in yellow and they are more expensive than my supplier...)
@ Boofer and DeejayDebi: I'm not very active (yet) on this forum, where should I start a new topic on this, because I'm of course willing to share my knowledge and experiences on this...
