Gadget Pro

You can use illustration board, watercolor paper in sheets, a watercolor paper pad or spiral bound watercolor sketchbooks. However, I prefer to paint gouache in 5.5 x 8.5 inch hardcover stitched-in watercolor journals.

The two I recommend are Pentalic watercolor journal (which has 100% rag, 100 lb paper), and the Strathmore 400 Watercolor Journal  (which has 140 lb paper and comes in hardcover and softcover formats). The Moleskine book is OK too, and has more pages than the other two, but the paper is thinner, so Id recommend that one if youre doing more drawing and dry media compared to watercolor.

Brushes
• Flats, synthetic 1/4", 1/2", and 1"
• Rounds, synthetic or Kolinsky sable, assorted sizes 4-10

A good bargain is to get a watercolor brush set with carrying pouch (regular length handles) or a short-handled water media brush set with carrying case. The latter will fit over the left hand page of the open sketchbook.

There are a lot of brands available, including very expensive Kolinsky brushes, but I dont think you have to spend that kind of money for most purposes. The cheaper synthetics can be very good. If I find a good brush, I buy a few extras to have on hand. Ive found brushes of acceptable quality at the big box craft stores for very reasonable prices, but you have to check them out. What you want to look for are brushes that have good spring or snap, not floppy. The brush should come to a fine point — or edge in the case of a flat. That way you can use a fairly large brush to paint your picture.

If youre painting in casein, use only synthetics; dont use natural hair brushes (bristles or sables) because the paint can be hard on the fibers.

Paint
The Holbein gouache sets are good quality, and you get a lot of colors for a good value. Holbein makes a set of 12 colors and a set of 18 (check the prices; I think the 18 set is actually cheaper), which I use all the time. They also make an Acryla Gouache line, which has a closed surface after it dries, meaning water wont dissolve the dry paint.

Winsor and Newtons set is good quality, but overpriced at $139. Edit: Heres a W/N 10-tube set for $43

Royal Talens  makes a set of 8 and M. Graham has a 5 color set, but they lack earth colors, one of the joys of gouache. You can always buy the set for the pure primaries and then supplement with individual tubes of raw sienna, yellow ochre, raw umber, and Venetian red or burnt sienna, plus black if the set doesnt come with it.

Heres a link-rich previous blog post about the various brands you can choose from. You can always buy individual tubes from other reputable firms but the price will add up rapidly.

What I do in practice is try all kinds of brands and colors. At any given time I carry around about 12-15 colors of different manufacturers. When I set up for a painting, I select the smallest possible set of colors that I need to paint the scene. I store unused tubes in large glass jars with lids that seal tightly. That keeps them from drying out.

Palette
It can be a plastic or metal tray of your choice, and it should be white or painted white. There are gray palettes, but I dont like them for watercolor and gouache because they make it harder to judge transparent mixtures.

I use the lid from a a colored pencil box spray painted white. It attaches to the bottom panel of my lightweight sketch easel with magnets.

Rags or Paper Towels
Paper towels made by Bounty are lint free. They can be dampened and applied to the palette to extend the working time of the paint, and of course they can also be used to clean brushes. Another solution for brush cleaning is old T-shirts cut into foot-square pieces.

Water Cup
I recommend the Nalgene 2 oz. jar for a palette-side jar and a 32 ounce plastic food container attached lower on the easel for cleaning brushes.

Pencil
A graphite pencil (HB) will do for the lay-in stage. If you want to use watercolor pencils, I recommend the Caran dAche Supracolor set of 18.

Pens

I use a Waterman fountain pen with brown ink for written notes. Remember that fountain pen ink dissolves in water after it dries, so unless you dont mind your lines being blurred, save them until the end. If you prefer to do linework before adding washes of water, you can use waterproof pens, such as the Microns, which come in many colors, including black and brown.

Water Brushes 
I use Niji Water Brushes with round tips. I normally carry between three and five water brushes. One is filled with water, and the others are filled with blue, black, brown, and gray water-soluble ink, such as Higgins Eternal ink.
Transparent watercolor kit
Having a watercolor set as an add-on isnt essential for gouache painting, but if you have a transparent cake set, it opens up many more options. I recommend a small set with in an enamel steel box so that you can hold it to your easel with magnets.

I carry two erasers, a Kneaded Eraser and a White Latex-Free Eraser.
Sharpener

Plastic clamps
Heres a 2-Inch Plastic Clamp and a 3.75-inch Clamp. Of all the clips and clamps that Ive tried, these seem to be the most versatile for holding the book open or clipping the watercolor box to the easel.

Chair and easel
The biggest decision of your setup strategy is whether to sit or stand. A tripod folding stool is a strong and lightweight option. I usually like to sit if Im painting something thats close to the ground, like a flower, or if Im painting an upshot.  Its good to have a chair if you want to hold the sketchbook in your lap. I use a homemade sketch easel that I described on an earlier blog post. The nice thing about a tripod easel is that it will work for either standing or sitting.

The workshop

Previously on GJ
Watercolor in the Wild materials

Gouache Ingredients