Encaustic FAQ

 

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The Most Frequently Asked Questions about Encaustics

If you can't find your answer here you can read other questions or post your own on the R&F Forum.
What is the difference between using medium as opposed to just beeswax?
What can I use the beeswax for?
What is Impasto Modeling Wax, what is it used for, and why use it instead of medium?
What is paraffin and how is it used?
What supports can I paint encaustic on?
Can I paint encaustic over or in combination with acrylics?
Can I paint encaustic over or in combination with oil paint?
How do I ship my encaustic work?
How do I store or clean my encaustic work
Can/Should I varnish my encaustic work?
Can/Should I frame my encaustic work behind glass?

 

What is the difference between using medium as opposed to just beeswax?

 

Medium is made up of beeswax and damar resin. It can be used as an extender for colors, as an isolator between layers in order to create a sense of depth, and for dipping paper or objects.
 

What the Damar Resin does:

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Increases the melting temperature so the wax is less susceptible to heat damage;

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Allows it to cure and harden over time making it more durable; 

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Prevents blooming (Blooming is a whitish haze that can appear on the surface of a painting. This can occur when encaustic has been exposed to extreme cold, causing unsaturated hydrocarbons in the beeswax to migrate to the surface and crystallize forming a whitish haze.  The addition of resins, or waxes that contain saturated hydrocarbons help prevent this.  These include damar resin or microcrystalline wax. The saturated hydrocarbons solubalize the unsaturated hydrocarbons of the beeswax and prevent the blooming that occurs from cold;

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Allows the encaustic to be polished to a high gloss, giving it more depth and intensity;

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Although beeswax and medium are translucent, beeswax by itself will not maintain its’ translucency, while medium (because of the presence of damar resin) will.             

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What can I use the beeswax for?

Beeswax can be used for sizing supports (if used thinly) as a cheaper alternative to medium.  It can also be used when artists want to make their own medium.

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What is Impasto Modeling Wax, what is it used for, and why use it instead of medium?

Impasto Modeling Wax is made up of beeswax and microcrystalline waxes (petroleum based wax).

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it is useful for building up texture, surface, and layers

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it has a higher melting temperature which allows for more time to mold, shape, model, cast, carve and form objects;  this also allows encaustic to be painted on top and fused without loosing its’ shape beneath

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it is less expensive than medium so building up those layers doesn’t break the bank

Please note:  Impasto Modeling Wax will oxidize and yellow over time.  It is recommended that you do not use it as a top layer (unless you want those results).  Keep in mind that any transparent color used over it will have the impasto undertone that may eventually yellow.
 

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What is paraffin and how is it used?

Paraffin is a white wax that comes from the refining of petroleum.  We recommend that it be used only for cleaning brushes.  It works by leaching out the pigment in the brushes. It should never be used for painting or in combination with encaustics because it is too brittle and can crack and chip off.  It also shrinks dramatically when it cools, making it very inflexible.  (We suggest keeping encaustic brushes just for encaustic painting, but if you want to use them for another medium, first remove the paraffin with use warm vegetable oil, than wash with soap and water)

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What supports can I paint encaustic on?

Encaustic should be painted on a rigid, absorbent, and heat resistant surface such as …

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Wood, untempered masonite (tempered masonite has an oil pressed into it that the encaustic will not adhere to, many lumber supplies stores are not really sure if there masonite is tempered or untempered so if they are not absolutely positive we recommend gluing paper to the board), lauan, doorskin (i.e. hollow core doors);

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Any heavy watercolor or printmaking paper glued to board;

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Raw canvas glued to board;

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Plaster, brick, unglazed and low-fired ceramic, or cast paper.

Please Note:  When wax gets cold, it shrinks and becomes more brittle, making it more vulnerable to damage, therefore, if you are uncertain if a surface is suitable for the encaustics we recommend a freezer test.  Prepare the surface as you intend to use it (fusing well), then place it in the freezer for 30 minutes.  Pull it out and hit at it with a hammer and scrape at it with a chisel or scraper.  If it is coming off in big chunks and doesn’t seemed to have absorbed into the surface then it is not compatible with the encaustic.  If it is staying on the surface and absorbed into it, this is a pretty good indication that it is compatible, although not guaranteed. 

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Can I paint encaustic over or in combination with acrylics?

No!!  Acrylic is not a porous enough ground for encaustic.  Also, acrylics should not be used in combination with encaustic since it is water-based and not compatible with wax.

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Can I paint encaustic over or in combination with oil paint?

Please see our Spring 1998 Newsletter for technical information on oil and wax. 

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How do I ship my encaustic work?

We put together Technical Data Sheet about this. It is in PDF format and available at the following link. Shipping Encaustic

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How do I store or clean my encaustic work? 

Encaustics should be cared for as you would for any fine art piece.  Work can be stored, wrapped in waxed paper and bubblewrap (be sure to face the bubbles out so they don’t make imprints in your work) at room temperature and out of any direct sunlight. 

Encaustics can be wiped clean with a soft cloth or paper towel.  If the piece is especially dirty, it can be wiped with a water-dampened cloth.

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Can/Should I varnish my encaustic work?

No, varnish will partially dissolve the wax, “reactivating” the surface.    In addition, encaustic has the natural appearance of a varnished surface (the damar resin creates a “varnish within”) and can be buffed (rubbed with a soft cloth or paper towel) to enhance that quality

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Can/Should I frame my encaustic work behind glass?

The greatest attribute of encaustic is its’ exquisite surface quality.  A good deal of this gets lost when the painting is framed behind glass.  Although, the glass does protect the surface from denting or scratching, but if the painting is properly exhibited/stored/shipped, this danger is minimized.  Almost all encaustic works exhibited today are done without being glassed.  We suggest, that only when the painting is done on paper that is not completely dipped in the wax, or if it is extremely old (as in the case of the Fayum portraits), should it be glassed.  In addition, framing behind glass can intensify the heat (particularly from gallery lights or sunlight) causing a greenhouse effect, that could soften or even melt the wax. 

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First posted September 1998
last changed 7/16/08
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