(There is a trick to correction with gouache: you don't dilute the touch up paint much. The problem though, is that it's hard then to reproduce the right hue (gouache changes much more as it dries, than the other media).
When I said it's great for the impatient artist, it's because it dries fast...and when I said it works well for inexperienced artists, it's because, without experience, it's impossible to really correct anything without botching the whole piece, no matter the paint we use.
I started to use it in Junior High, at the same time as china Ink. If you want to talk about a devilish medium for correction
at any rate, no matter how often my Junior High art teacher made us sing: "la peinture Ã l'huile c'est bien difficile, mais c'est bien plus beau que la peinture Ã l'eau", painting is darn difficult.)
edited to avoid giving Elfpop another headache