Linseed Oil Paint Notes (to Date)

Chris and I have been experimenting with linseed oil paint for about a year now, since he started working on his next book, “The American Peasant,” and we’ve both painted a lot of wooden stuff with it – from large flat surfaces on chests to fiddly roundish bits on stick chairs to decorative curves and pointy things. We’ve used it on ring-porous woods including oak, ash and elm (looks great; it is a pain in the posterior, like all paints on ring-porous woods) and closed-pore woods such as poplar, linden and white pine (looks great, easy to apply). We have not used it on other material, but I’ve read that it will stick to many other building materials (plaster, metal, masonry and more). I’ve even read claims that it will stick to anything. But I know for a fact only that it sticks to wood (and fabric).

What we have not done is tried every color, brand or brush available. And, all of the stuff we’ve painted is indoor stuff. We have no personal experience with this paint on exterior work…though I am hoping to have some in the near future, if I can find someone to use it on my house for less than the going rate for a kidney*.

This is what we know, thus far.

Most linseed oil paint is made from raw linseed oil and ground natural pigments – no added binders, driers, solvent or synthetic emulsifiers – so it’s far more environmentally friendly than most hardware store paints. (Milk paint is also environmentally friendly – my hardware store doesn’t carry it or linseed oil paint.)

Linseed oil paint is more expensive than latex, acrylic or milk paint (the other paints we know well). However, it takes fewer coats for full coverage – so penny for penny, it ends up not so expensive after all (plus it takes less of your active time – and no sanding! – if you’re including the human factor in your price calculations). Depending on the wood, we have found that it takes one coat (closed-pore woods) or one coat plus a touch-up here and there (ring-porous woods) for coverage that fully colors the surface and allows the grain to show through (which is what we want). Neither of us has had to apply two full coats to achieve our desired coverage – though if you want to cover the grain a second coat will do it, in our experience. (The hanging cupboard that is now the Anthe bathroom cupboard has two full coats of paint only because Chris decided he didn’t like the green of the first coat on that project, so it’s topped with one coat of blue – and on that piece, the grain no longer shows through. NB: He likes the green, just not on that project. He’s a mystery.)

Linseed oil paint is a lot thicker than any other paint we use, and with a good (or at least decent brush), a lot will remain in the bristles, and you should “draw it out” quite a ways from the initial strokes. That is, deposit the paint from the brush onto the project, and make long strokes, pulling the paint with as you go, then go back to the original deposit of paint and draw it out again, overlapping the first stroke. I don’t have to dip the brush back in the paint as often as I do with latex, acrylic or milk paint. But because of its low viscosity, you might find the linseed oil paint more difficult to use at first – or at least different than what you’re used to. Be sure to draw it out a lot and not leave it too thick, or it will drip and/or sag as it dries (and take longer than it ought to dry). It’s kind of like spreading a crumb coat on a cake – you want full coverage, but nothing extra.

Some instructions say to wipe on a coat of washed linseed oil and let it dry before painting, others say to use the paint on bare wood. We’ve done both, and both have worked for us. For what it’s worth, I am now a convert to a base coat of linseed oil. It makes it easier to draw out the paint (much like a second coat of most brushed finishes are easier to apply than the first coat).

I’ve tried out a number of brushes, and Mattias Hallin, a long-time user of linseed oil paint, says his favorite are the Gnesta Penselns shown above. Hardware store brushes that are decent are the Wooster Yachtsmans. I think you can see from the picture, though, that the brushes on the left will hold a heavier paint load. However…then you have to clean them; they’re too nice to toss. (More on that at the bottom.) Travis at Heron paint recommended to me Escoda Natural Chungking Bristle Brushes, but I’ve not yet tried them (also too expensive to not wash!).

Most of the instructions I’ve read say to use the paint as it comes…but we’re good at disobeying. To make it a little easier to draw out and to make it lay out better with less effort – that is, dry without brush marks (without having to “tip off”) – we sometimes add about 10 percent low-odor mineral spirits and mix it (yes…this makes it less environmentally friendly – and I would not dilute it for exterior work). I cannot stress enough to mix it well…whether or not you add mineral spirits (or turpentine, which the owner of Heron Paint said he uses when he needs to thin the paint a bit). The pigment settles fairly quickly, and you want it to be evenly suspended in the mixture. So, I have made friends with every hardware and paint store between my house and the shop; they are kind enough to shake up the paint as needed in their fancy paint shaker machines. I try not to abuse the privilege…which is why I spread my mixing asks among four locations. (I want a fancy paint shaker machine for our shop – preferably the old kind that clamps top and bottom, and runs the risk of spraying paint everywhere should the top come off the can. The newfangled fully contained ones are no fun – not enough risk. Plus they’re a lot more expensive.)

Linseed oil paint takes a lot longer to dry than any other paint we use. So while it takes only one coat, or one coat and some spot touch-ups (either while the first coat is still wet enough to easily work, or after it’s completely dry), it will be dry to the touch after about 24 hours at average room temperature and low to mild humidity – and even then, there will still be some areas where it might have been applied a little too thickly that will transfer to the white shirt you shouldn’t have worn while leaning up against it. We have found it takes two or three days to completely dry (longer in cold and/or humid conditions) to the point where it’s “carveable” without making a small mess (in case you, too, are covering your work in spells). If you have curious pets or curious kids, keep them away from the work for a while. And you do need to be mindful of kicking up dust around a freshly painted piece for 24 or so hours, as it can stick to the wet paint. You can speed up the drying by exposing the work to UV light – but do not put it in direct sunlight to dry (that resulted in a pimply surface when we tried it).

About the “easily work” I mentioned above: I’ve found I have about two hours in which I can manipulate the fresh paint and still have it lay out flat as it dries. Any longer, and it’s already dry enough that the brush marks remain where I’ve gone back and retouched an area.

More coats of paint will make the finished item shinier – so if you like shiny (we prefer no more than a soft sheen), consider more than one coat. After the piece is completely dry, you can add a topcoat to adjust the sheen a bit to your liking, and to blend areas where the paint looks more flat and/or more shiny (which I think might be a result of adding mineral spirits…though I haven’t yet done enough “experiments” to back up that statement). We use soft wax or simply a coat of washed linseed oil.

So what is this “washed” or “refined” or “purified” linseed oil? It’s a purified version of raw linseed oil, and all we know for sure is that it is lighter in weight, lighter in color (and so results in less yellowing) and dries faster than plain ol’ raw linseed oil. There is also “blown” linseed oil, which is another method of purification that involves air, and is even lighter in weight and dries faster still. We hope to have expert information on these processes in the future, and more experience with the various purified/cleaned/washed/blown/magically delicious versions of the stuff. But for now, we can tell you that “purified” dries faster and yellows less.

What about cleanup? Well…here’s where my argument for using this paint falls apart (a little bit). Linseed oil soap is what everyone says to use for cleanup. And it works. But it does not work quickly or easily. I cleaned one brush and it took three intense rounds of soaping, combing and rinsing…and I still wouldn’t call that brush perfectly clean. I’ve read that the easy solution is to simply suspend the brush in linseed oil, and it remains at the ready for the next use! OK…but the number of blues I have alone…I don’t have room for suspending five brushes, and I have cats. So I use the relatively cheap Yachtsman brushes, and throw them away. (Yes, in this I am a bad person.) And because it’s linseed oil, I let the brush dry hard before putting it in the trash (ditto on any rags I’ve used).

So when would I use linseed oil paint vs. acrylic (faux milk paint) vs. actual milk paint? Well, they all result in different looks, so that’s my first consideration.

Linseed oil paint gives it an old-world look, and, after a topcoat of oil, has a low sheen that I like. And it “feels” like the right choice for any project of Scandinavian or Eastern European origin (but that’s probably because we started using it on American Peasant projects). I have yet to try it on a tool chest – and won’t offer it for commission chest builds until I’ve road-tested it (which I will do soon). Plus it’s harder to clean up afterward…so I have to be a lot more careful when using it than I do with “milk paint” or milk paint. That would be factored into the finishing cost (along with the one-use paint brush). But I’d use it on a personal project for which I had ample dry time during which I could keep any cats away (two scenarios that almost never coincide!).

General Finishes “Milk Paint” is my long-time favorite for ease of use, price and cleanup. It dries with an almost-flat finish, cleans up with water, goes on easily, lays out nicely, dries quickly and typically takes two coats. And because it dries quickly, I can recoat late in the day if my first coat was early that morning. Plus it needs no topcoat – so two coats and done, then easy cleanup. I can apply it with a cheap chip brush and toss it, or use then easily clean one of my long-beloved Purdys. (Sherwin-Williams bought Purdy in 2004 – I don’t remember exactly when the brushes changed, but change they did. I haven’t liked any I’ve bought since.) However, last year, General Finishes severely curtailed the color choices, and got rid of my two favorites, Twilight and Blue Moon. (Yes, I know I sound like the old fart that I am.) And no local paint store carries it – so I’d have to buy it one place, then pay another for the privilege of mixing it to a custom color. Boo. (And that’s high on the reasons why I’m planning a road test soon on the linseed oil paint.)

Actual milk paint is a lot of fun to use. But it’s also a bit of fuss. It takes many coats, and while it dries quickly and cleans up easily, it doesn’t always behave as I might expect, and each color I’ve used performs a bit differently. So, there are a lot of test boards and a lot of time involved in getting a good finish (for me) from milk paint. (Peter Galbert and Travis Curtis both produce gorgeous milk paint finishes – and I think they would agree that it’s not a fast process…even when you use it all the time!) Plus most people prefer it with a topcoat (though I love the dead-flat look it imparts), and that can’t be done until the paint is fully cured – and the more layers there are, the longer that takes (after a few bad experiences, I don’t even think about a topcoat until a week has passed after my final paint coat). But there are a lot of gorgeous colors available, and I love the variegated look I can achieve with it. (Plus, kids can chew on it safely. Not that I encourage such behavior.)

And that’s all the topics I can think of for which have answers…but I expect we’ll have more info to come.

Happy painting!

– Fitz

*A bourbon-loving-person-of-Irish-heritage kidney – so, not worth a paint job.

Source: lostartpress.com