Gouache painting techniques are usually used on watercolour paper, white or tinted.
You can also use coloured pastel paper or mount board.
I would recommend heavier papers to give a more stable surface for the paint, especially if you like to paint in numerous layers.
They are also best preserved under glass using a mount
Gouache paint is designed to be applied fairly thickly; diluted with too much water and they can 'powder off'; applied in too many thick layers and they have a tendency to crack.
The cracking is due to the under layers, absorbing the water and Gum Arabic out of the newly applied paint, but it only become apparent when dry.
'Less layers are best layers' with Gouache!
I especially like them for small and detailed paintings, give them a try, they can be very rewarding, I did my following painting over colored pastel light blue paper Strathmore 500 series, without layering
"Time flies over us but leaves good memories"
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