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Sunday, November 30, 2008

Making Your Artwork Last

The word “archival” is tossed around quite a bit among painters. Archival can be a process, technique or material - when used or added to your artwork, helps extend the length of time that your art will look the way you intended. Some common aging defects in artworks that develop over time are yellowing, cracking, or dust embedding into the top layer and graying the colors. As professionals, it’s helpful to know there are a handful of easy inexpensive ways to keep those things from happening, or at least keep the odds on your side of keeping your artwork intact over time.

Here is a list of some key archival methods. I am sure there are some not included, but these are the main, most important ones. Please feel free to add other ones if you think I’ve missed any.

Before reading on….its important to note that it is not necessary to do every single one of these archival procedures. Adding any one of them will add longevity to your work. Feel free to select only those that work for you and your art.

(1) Selecting a Substrate or Surface:
Use a rigid and sturdy painting surface. A panel isn’t as flexible as canvas on stretchers, so with less movement, there’s less chance of cracking. There are many great commercial panels on the market. I like to use Ampersand’s Hardbord (http://www.ampersandart.com), but they have many other types available. I also use a local cabinet maker to create customized panels when I work large or need an unusual size. I still enjoy working on stretched canvas, but I find the panels are a joy to work with.

(2) Stain Sealing & Priming:
Stain Sealing:
Before priming, there is an important step called “stain sealing”. Stain sealing is not necessary for oil painters, but is essential for acrylic painters, especially anyone working thickly or in several layers. Start with an unprimed surface if possible.

(*If it is already primed, then the primer is usually of cheaper quality - OK for oil painters - but not OK for acrylic painters. The cheap gessos can create adhesion problems later. Lets say months after your painting is finished, you send the painting to Florida where its moist and hot, then it goes to a cold climate, then back again. Your adhesion layer, or primer, is what keeps the paint sticking to the surface during all the fluctuations that happen, and if its of bad quality, your painting could flake and peel off.)

Stain sealing keeps any impurities from being absorbed into your acrylic painting layers. These impurities can create stains or cause your paint to yellow. The more thickly acrylic is applied, the more likely it is to pull any impurities up through the support and into the paint layers. There are two choices of products to use for stain sealing. Commercial stain blockers such as Kilz, are available at paint, hardware and home improvement stores. Kilz, similar to most commercial stain blockers, is formulated for walls and other rigid supports and should not be used on any flexible artist’s support, such as canvas. Golden has a stain blocker called GAC 100 which is specially formulated for fine art work, and can be used on canvas and other flexible surfaces. GAC 100 will work well on any surface and would be the more archival choice.

Priming:
There are many reasons to prime your support. Oil painters need to prime canvas and other supports to keep the oil paint from destroying the natural fibers in those surfaces. Acrylic paint, though, is safe to use on most supports and can be painted directly without primers. Priming for acrylic painters is still recommended, though, for other archival reasons. Priming will increase adhesion, or the bonding of paint to support. Priming, then can make your painting last longer and ensure its stability. If your painting gets caught in a flooded storage area, or ends up moving frequently to different climate zones, the primer will strengthen the bond between painting and support, reducing cracking and other possible defects that can occur.

There are reasons you may not want to prime. For instance, let’s say you are painting over a beautifully patterned piece of fabric. You wouldn’t want to prime, or you would be covering over the pattern with the white primer (and clear primers aren’t a valid substitute – in my opinion).

(3) Using Light-Fast Pigments:
Select paints with a higher lightfast rating. The lightfast rating for each paint is often listed on the product label. This lightfast system was developed by the American Society for Testing and Materials (ASTM). If the rating is I (Excellent) this paint will be a great choice for outdoor murals and other archival painting needs. A lightfast rating of II (Very Good) means this paint should last for over 100 years and is therefore well suited for archival painting needs. Paints with a lightfast rating of III or more should be avoided in a painting, unless longevity is not desired. If you are working on a mural outdoors, then this is an important factor. When selecting the colors you will use on this mural, you can easily pick the most light-fast ones by using the charts available.

(4) Using Professional Products:
Cheaper products have filler and low quality ingredients. That means they may not look the same even a year after your work is complete. As an example, home improvement products, like paints from Home Depot or other home improvement stores, sell acrylic or latex paint that is much cheaper then fine art products. All paints are made of pigment (for the color) and binder (makes it into paint). So even though Home Depot paint is acrylic, the manufacturers know you will be painting on a rigid surface, and only need it to last about 5 years, whereupon your house wall gets repainted. Yellowing, flexibility and longevity are not factors for commercial paint manufacturers. By selecting professional “fine art” quality products you are adding a great benefit to the longevity of your work.

(5) Varnishing with UV Protection:
It is important to know about varnishing, as it is one of the best ways to protect a painting. It is also the only way to insure that the painting can be cleaned later. This is true for oil paintings as well as acrylic. First of all, due to environmental factors, paintings on any surface will expand and contract over time. Acrylic will soften in warm temperatures and stiffen in cold. This amount of movement will not crack or otherwise harm the painting, however, it will encourage the collection of dust on the painting’s surface to merge into the top layer of paint. The dust dirties the painting causing yellowing and haziness. The dust cannot be removed from this top layer of paint. An archival varnish, one that is appropriate for fine art paintings, is non-yellowing and removable. When applied as a final layer over a painting, this clear removable finish will collect the dust and being removable, offers a way to clean the painting. To professionally clean a painting in a museum, conservators remove the old varnish and apply a new coat.

Avoid using a varnish from a commercial paint store (generally formulated for household use like wood porches and patio furniture) which is not removable and will yellow over time. Using this type of varnish will ruin your work of art and you will not be able to remove it. Be wary of acrylic products labeled “varnish and medium” on the same container. A medium is permanent and a varnish is removable, so it is impossible for one product to be both. The paint companies that make these products are using the term varnish loosely for a craft market to mean “sheen”. Check the product label to see if there are any instructions on removing the varnish. If there are none, then this is not an archival varnish.

Damar Varnish, which is produced by many paint companies is a traditional varnish which can be used on oil or acrylic paintings. Damar tends to yellow slightly and is only available as a gloss sheen, but is removable, so it is a good choice. I prefer to use Golden’s varnishes, as they offer several advantages over Damar. They are available in varying sheens such as gloss, matte and satin; and have UV protection which will help protect the paintings from fading due to light exposure, making them a great choice for outdoor murals. The UV protection also makes these varnishes a good choice for ink jet prints which fade quicker due to the inks used. They will not yellow or crack.

Varnishing can be very easy and it can also get quite complex. Visit Golden’s website at www.goldenpaints.com for a great detailed instruction sheet on varnishing with lots of how-to details. I recommend reading this information before starting to varnish. I also recommend experimenting and testing on scrap work before trying it out on an important finished painting. Varnish should be applied over a non-absorbent surface. Applying an isolation coat on your finished painting before applying a varnish will insure that the finished surface is non-absorbent.

(6) Care & Storage
To properly care for your acrylic paintings after they are completed it is important to understanding the paint’s drying process. Acrylic is “dry to the touch” when the top layer of the paint skin has dried, but the acrylic is not completely cured until the entire thickness of the paint layer is dry. This may take several days to several weeks depending on the layer’s thickness and environmental factors. Until the painting is fully cured, waiting at least two weeks to be sure, do not wrap it up too tightly or store the work in a closed environment. In addition, especially during this curing phase, do not expose the painting to extreme temperatures below 35 degrees Fahrenheit. If your painting freezes during this curing phase it may never recover enough for the paint to form a strong paint film and bond. Even after this curing phase there are still some considerations to handling an acrylic painting. When wrapping your painting, be sure that you use smooth wrapping materials. As mentioned earlier acrylic paintings will soften in hot temperatures and stiffen in cold. Let’s say you use bubble wrap with the bubble side of the wrap in direct contact with the painting’s surface. If it gets hot while in transport the acrylic may soften and take on the impression of the bubbles. When the painting gets hot and softens it also may stick to other surfaces with which it comes into contact. Use a non-stick plastic such as HDPE in contact with the painting’s surface. When the painting surface is glossy it has more of a tendency to get tacky in hot weather and stick. Be kind to your paintings, they are worth it. Occasionally wipe the painting off with a damp cloth to remove dust and any other elements which may come through to the upper surface long after the painting is cured.

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17 Comments:

Blogger steve urwin said...

I like your down to earth attitude,although I see you smile as you write! good stuff-where have I been until now to have only just discovered your page?

December 28, 2008 at 9:17 AM  
Anonymous Darice Machel said...

I have a question for you....When does Hide glue stop cracking? I have painted three layers on top and have varnished it, then I added another layer of paint on top of the varnish it cracked. I've also had a painting damaged in a flood. The water reactivated the glue and caused rippling. Does Hide glue ever dry? How do I make these paintings more stable?

January 10, 2009 at 10:40 AM  
Blogger Nancy Reyner said...

Darice,
Hyde Glue will always reactivate when it comes in contact with water. If you want it to stop you will need to seal it better. I recommend applying a gel in a thick layer (at least 1/4" thick. Let this dry about 3 days. That should stop any water from subsequent layers coming into contact with the Hyde Glue. You may want to seal the sides of the painting too - so water won't seep into the glue from the sides.

January 10, 2009 at 5:07 PM  
Blogger Chris Frosztega said...

I agree with you. Art can and does heal. Great tips!

January 15, 2009 at 6:03 AM  
Anonymous Maria said...

Thank you for sharing. I love painting but I don't know much about the technical side. Great advice.

January 21, 2009 at 9:04 AM  
Anonymous Monica Kelly said...

Hi Nancy-
So if I am interpreting correctly, the GAC100 is for priming canvas prior to acrylics, but not for a hard support such as ampersand?

Thank you for sharing such great technical information.
Monica Kelly
mikikelly@verizon.net

January 30, 2009 at 6:03 AM  
Blogger Nancy Reyner said...

Dear Monica,
GAC100 can be used on both rigid supports (like Ampersand's Hardbord) as well as flexible supports like canvas. GAC100 is a fine art product, and so this is your best choice for stain blocking on any support for a fine art painting. I also gave as an alternative, the idea of using Kilz (a commercial product) for stain sealing. Kilz should not be used on flexible supports like canvas, as it is formulated for walls. Commercial products are not as good as fine art products for paintings as they are not tested for fine art quality and longevity in the same way.

January 30, 2009 at 8:45 AM  
Blogger rania said...

that sure look like a nice place to live at. I reely like it!


Regard
http://www.buy-fineart.com/

May 20, 2009 at 7:45 AM  
Blogger Ramesh said...

Hi Nancy

I have few questions on this subject, hope you can clarify them.

1) You write: "..I also use a local cabinet maker to create customized panels when I work large or need an unusual size...."

Does this mean I can use boards that are sold in hardware stores for painting purpose? AmpersandArt's Hard boards do look same as the ones sold in hardware store. In India, art stores do not sell any kind of hard surfaces at all, but Hard boards are available in hardware stores. So this is why I am trying to clarify this point.

2) creating Texture on Hard boards

Hardboard have dead smooth surface, what your suggestions on creating some kind of generic texture? I do not think etching the surface is a good solution. I can use Golden's texture Gels, but seems overkill.

3) Stain sleaing
You say "...Stain sealing keeps any impurities from being absorbed into your acrylic painting layers. ..."
Do the impurities come from front side or back side through the canvas? If the impurities are coming from back, 'boards' may not need Stain sealing. May be that is why you started saying "..Adding any one of them will add longevity to your work...".


4) Your Book
I read your book last year and it was inspirational, in the sense it forced me to look beyond color tubes, and after that I made painting using pastes(cracking & non-cracking :-)), Gels, Clear Tar etc. Now, Gels do not intimidate me.

Golden representative suggested to start with 'Hard surface', if I were planning to use pastes, and this is core reason for to me leaning towards hard surfaces.

Thanks
Ramesh

May 25, 2009 at 1:44 PM  
Blogger Nancy Reyner said...

Dear Ramesh,
Here are some answers to your questions:
(1) You can use any board for painting purposes. If the board is not a fine art product, though, you will need to clean it well (with solvents), stain seal, lightly sand, and prime. See my original post for details on those. It’s also in my book, and on Golden’s website www.goldenpaints.com
(2) To create texture on a smooth board, you can (a) sand it, or (b) glue textured fabric, objects, dust, sand, etc. (c) apply a gel or paste and press objects, fabric, screens onto it or drag a comb through it.
(3) About stain sealing – acrylic layers on any surface (yes, any surface) pulls any water soluble impurities from the surface into the acrylic paint layers. The impurities are in any surface and are within the material, so they exist front and back and all throughout.
(4) I am glad you are enjoying my book.
Ramesh I hope this helps.
Nancy

May 28, 2009 at 5:53 PM  
Blogger michael said...

Dear Nancy:
You provide refreshingly sound advice. So many artist mirror what they learned from poor sources and perpetuate the support of poor working techniques. I wish I had a dozen artists like you serving on my ASTM subcommittee D01.57, Artists' Materials. We create standards for the art materials industry and input by consumers is critical to the makeup of the subcommittee. Many artists know about ASTM D4236 for health and safety but we publish many more standards for quality and performance of art materials. Perhaps you might consider getting your "feet wet" by becoming an ASTM non-member associate. I can assure you that you will learn a lot more about the manufacture and properties of art materials. Contact me at my work email for more information.
The address is m-skalka@nga.gov
Thank you for considering this invitation.
Michael Skalka
Conservation Administrator
National Gallery of Art
Chair, ASTM D01.57

July 16, 2009 at 10:25 AM  
Blogger Christopher Guerra said...

Whats the best way to prime paper? Best being the easiest

August 1, 2009 at 4:51 PM  
Blogger Nancy Reyner said...

The easiest way to prime paper is to just brush apply an acrylic product such as gesso, or matte medium. Use a heavier weight paper, and a wide flat brush. Avoid adding any water, either from your brush or adding it into the product. After you apply the product to one side of the paper, you can turn it over after it dries and apply the same product to the reverse side to help keep it from warping.

August 1, 2009 at 8:13 PM  
Blogger Peter said...

I like your attitude. Like you, I really love art. It really heals.

Regards
Peter
Canvas paint art gallery

September 29, 2009 at 3:51 AM  
Blogger nushi said...

Thank you for a very informative article! I am painting on a wall and I am trying to find out what are the most suitable materials. It's a 4 x 4 mts wall made of plasterboard (or plaster) and painted (I would imagine) with household paint. Which primer would you recommend for acrylics on wall? It may be worth mentioning that it is an interior wall. Also, if you could suggest a varnish it would be greatly appreciated!

February 4, 2010 at 4:01 PM  
Blogger Nancy Reyner said...

Acrylics work very well on walls. I would start with a coat of GAC100 or Kilz to keep anything from seeping into the painting from the walls and paint already on there. Then I would add one coat of a good gesso primer. After painting it apply 1 or 2 coats of a gloss varnish. The Polymer Varnish is less smelly and toxic then the MSA Varnish and dries faster so it won't drip as easily.

February 7, 2010 at 5:49 PM  
Blogger Gexton said...

The word “archival” is tossed around quite a bit among painters. Archival can be a process, technique or material - when used or added to your artwork, helps extend the length of time that your art will look the way you intended.
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May 16, 2013 at 10:25 PM  

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