I have always liked to line and/or outline some of my shapes in paintings. Always have been known more for being a line/shape painter rather than letting value define shapes and form. So if you have looked at some of my recent watercolors, there are some lines and outlines of my shapes.
The reason I am mentioning this is because I want to eventually enter some watercolor art competitions and exhibitions. The rules for submitting pieces in the watercolor category of these events require that all the paint on paper is water soluble. I have been using watercolors and gouache, but using acrylic paint for the lines because you won’t lose them or mix if you put a glaze over. So I am dropping the acrylics in the watercolor paintings and will use more gouache and thicker watercolor for the lines. There is a big difference.