Vallejo's site mentions on the Model Color page that some of their paints (Colorima line) are alcohol-based and not water-soluble.
A few metallic pigments (in an alcohol base) are included in the range,
since these give a harder brilliance than the waterbased metallics.
(Please see “
From the Liquid Gold link:
"Colorima is a range of 30 radiant colours, manufactured with permanent
dyes which are not water soluble. Objects painted with Colorima are
lightfast and waterproof, and can even be cleaned in a dishwasher.
Colorima is used mainly in hobby and handicraft
painting, in colouring dried or artificial flowers and the tinting of
wood, leather, cork and figures cast in resin, gypsum and marble dust
All colours can be mixed with one another, with Medium
or Gloss Varnish. Brushes and painting tools have to be cleaned with
alcohol, and Colorima itself is classified as flammable due to its
alcohol content, although it is not toxic in normal use. (See “ Safety-Alcohol
I had not heard of the Colorima line before reading that. Seems pretty CLEAR to me that some of their paints are in fact alcohol-based and NOT water-soluble, although I'm guessing Colorima isn't used as extensively by scale modelers as the Model Color or Air lines of Vallejo.
As a clarification to my previous post, Vallejo's diluant is intended for their Model Air line of paints.With regard to these, their diluant is specifically recommended:
The Model Air colours are manufactured with permanent fine arts
pigments, and formulated especially for air brushing. The extremely
fine milling of the pigments provides the model painter with the
assurance of an even and smooth paint film, allowing for many coats
of colour. Colours can be mixed with one another, diluted with water,
Model Air Thinner or Varnish or even alcohol, according to the effect
desired, but we recommend the use of Model Air Thinner since this
product conserves the properties of the colours."
And who said anything about using other brands' proprietary thinners with Vallejo paints??? No one so far as I've read.