How to change font only in gnus-article buffer ?

[Sander Boer]

Hi,

When reading mails/news (and eventually, also when composing a new
message) I want to be using a variable-width font as opposed to a fixed
width font.
Funny thing about the article body displayed by gnus, there is no face
associated with it. This means I can only change the default font (or
toggle variable-pitch-mode, which is lame).
Is it at all possible to change the default font in only one buffer ?

thx

-- 
Sander Boer