You can use this technique to make painted cut-outs or you can apply the paint directly on the cake.
4.
Use a damp (not wet) sponge to spread the paste. Don't rub the surface of the paste, but tap it gently with the sponge.
Don't apply too much water on the sponge - it will dissolve the flower paste.
Try to spread the colours so that there are areas with different shades. If you are painting a larger area, you might need to wash the sponge from time to time to remove the excess of the paint off.