How to use mediums with Designers Gouache
• Each colour should be tested by mixing it with the medium and leaving it to dry. There may be a colour reaction between some of the pigments and the medium due to the alkalinity of the acrylic resin. This is most likely to occur with pinks, violets and magentas.
• There may also be a chemical reaction when mixing the medium and colour together, beware of any granular or gelatinous effects which may occur, again due to the alkalinity of the resin.
• If you wish to maintain the characteristics of gouache paint, keep the addition of the medium to a minimum. If you add too large a proportion of medium this will result in a ‘plastic' look to the colour.
• Using acrylic mediums will increase the transparency of gouache, particularly if using the gloss medium.
• Water resistance can be achieved by adding small amounts of Acrylic Matt Medium to your Designers Gouache colour.
• It is also possible to use Acrylic Gesso Primer with Designers Gouache. This will ensure the correct absorbency and film stability expected for permanent works of art.
Whilst mediums can be used with Designers Gouache we would recommend experimenting with each colour to see how they work for you as any changes in the paint’s characteristics will be visible on your palette.