Materials
There is no special equipment for marine paintingonly what is necessary for any other subject matter. As in any form of art or craft, it pays to use the best materials. Unlike most manufactured articles, the cost of paint and canvas compared to the value of the finished product is minuscule. Time, skill, and knowledge are the big factors. So dont waste effort by using poor supplies. The quick sketch done in haste on a piece of cardboard may turn out to be a little gemand afterwards you may wish you had used better stuff to work on. Workers in wood and metal and other craftsmen insist on good tools and materials, and so should you.
These days oil paints are almost all of a good grade and meet the requirements of the Artist Oil Color Standard issued by the National Bureau of Standards of the U.S. government. Where they differ most is in the percentage, if any, of fillers mixed in with the pure pigment. The fillers are neutral substances that are mixed in (coprecipitated) with the pigment to give more bulk. There is nothing wrong with such paints; they just are not as strongthey dont have as much tinting power when mixed with white as paints composed of pure pigment. They are also not as expensive. Labels on tubes of paint must tell you the composition. The vehiclethe liquid mixed with the dry pigmentis usually linseed oil and probably varies little in quality from one maker to another. What often does vary is the amount of vehicle. Some paints are definitely mushier than others. Usually the more expensive brands are firmer.
Some pigments are more permanent, are less likely to fade or blacken, than others, and these gradations of permanency are shown in the color charts of most recognized color makers. Colors differ slightly from one manufacturer to another. Find the ones you like and stick with them.
So much for the colors themselves. Now for what you put them on. Lets get a couple of terms straight first. The canvas, board, panel, or whatever, is the support; the coating of white lead or gesso is the ground. Commercially primed canvas is usually tacked on wooden frames, or stretchers, so called because the interlocking ends provide room for little wooden wedges or keys. When tapped in place, they can, if desired, stretch a canvas drum tight.
Most artists seem to prefer the bounce that they get when painting on a stretched canvas. As it happens, I dont, so I glue my canvas on Masonite or smooth quarter-inch mahogany plywood. Prepared canvas boards, mostly cotton covered, I avoid, because the cardboard on which they are mounted is not made with permanence in mind. They are fine for students, though, who often wipe off a painting at the end of the days session and reuse the board several times.
I usually buy unprimed linen, which has a more varied and interesting texture than cotton, and size it after it is glued to the board. If you want to try this, roughen the surface of the Masonite (dont use the tempered variety) with sandpaper, then give it a generous coat of rabbit-skin glue dissolved in hot (not boiling) water. A cheap egg beater does a good job of stirring it up so that there are no lumps. While working with rabbit-skin glue, keep it warm in a double boiler. After the first coat is dry, cut the canvas an inch and a half larger than the board on all sides, give the board another good coating of glue, then lay the canvas in place in the center and smooth it out, starting from the middle and working toward the edges. Turn the canvas face down, make a diagonal cut across each corner, apply glue liberally to the edges, and fold over. Put a weight in the middle to hold the board flat while the glue is drying.
The priming is a matter of choice. White lead, thinned a bit with turpentine, can be used, or a prepared gesso. I use acrylic gesso (it isnt really gesso, but its pretty thick). Thin the first coat a bit (follow the directions on the can) and paint the back of the board as well as the canvas. Work it into the weave of the canvas with a stiffish brush. When its dry, sand the canvas side very lightly with fine sandpaper and apply a second coat without thinning. If you like a tinted canvas, mix some acrylic paintmaybe burnt umber and a little blackwith the second coat.
Sometimes I prefer a smooth surface and paint directly on a Masonite panel, priming it with at least two coats of acrylic gesso sanded slightly after each coat.
The choice of colors is up to the individual artist. I use ultramarine blue, cobalt blue, cerulean blue, phthalocyanine blue, phthalocyanine greenthese last two are sometimes sold under a makers brand nameviridian and a yellow green such as Grumbachers Thalo Yellow Green, lemon yellow, cadmium yellow medium, cadmium orange, cadmium scarlet or cadmium red light, alizarin crimson, yellow ochre, raw sienna, burnt sienna, Indian red, burnt umber, Paynes gray, and ivory black. To these I may add other colors, depending on the painting. I always arrange my colors on the palette in the order given above, starting in the lower left-hand corner. White goes in between the yellowish green and the greenish yellow. Whatever order you use, stick to it so that you automatically reach for the same spot when you want a color.
When painting outside, which I seldom do, use the palette which fits in your sketch box. In the studio I use a sizeable piece of heavy glass painted light gray on the underside. If I forget to clean it after a days painting, a very sharp putty knife or a razor blade in a holder will do a good job. If some small bits of dried paint remain, I scrub it with a little steel wool dipped in turpentine.
For sketching outside there are some very fancy (and expensive) collapsible easels on the market. Sliding a canvas board, though, into the slots provided in the lid of the sketch box and sitting on the ground with the box between the knees works quite well. As I never do more than sketch outdoors, this method works for me, but those who prefer to work on a stretched canvas or on a prepared board larger than the box will need something more elaborate.
I made my easel, but you dont really need anything as heavy or as complicated as what I have. There are many good easels on the market. My wife prefers one of the aluminum types, very light yet sturdy and easily transportable.
My studio easel is of the crank-up variety, with a shelf for tubes of paint, a hook or two for rag or paper cleanersI like the heavy-duty type used in garages and machine shopsand on one side a holder for a roll of toilet paper (very useful for wiping knives and small but messy cleanup jobs).
Paints may be thinned with a medium. Depending on the nature of the support I am working on and the effect I am trying to get, I often do not use any medium at all. Most paints are mushy enough without adding medium. Usually when working with a painting knife, I use the paint as it comes out of the tube. When I do want to thin paints, I use a mixture of five parts turpentine and one part copal varnish or stand oil. There are many mediums on the market, as well as the old standby, half linseed oil, half turpentine. The main thing to remember is to work fat over leanthat is, to use medium with less oil in proportion to turpentine in the underpainting. When that is thoroughly dry, you can safely overpaint with a fatter mixture. Of course, this doesnt apply when painting alla prima (wet into wet).