<p>If you want the canvas to be raw it will discolor but if you want it to look raw and are ok with covering it, then use a good quality acrylic gel medium. Golden makes several, and if you use a matte gel and cover both sides of the canvas you will not have any yellowing as it will be insulated from oxidation. Matte, is suggested because a thin coat is almost impossible to see. Gloss will show itself.</p>

CC BY-SA 4.0
2021-08-12T13:56:53.670Z
2021-08-12T13:56:53.670Z
James Austin Murray
<p>The quick fix is a sealer so the tannin or stain can't penetrate through. Stain blockers that are oil-based primer/paints, spray shellac, polyurethane, or even wax.</p>

CC BY-SA 4.0
2021-01-29T17:55:41.990Z
2021-01-29T17:55:41.990Z
Isaac750
<p>What coat can I apply on a gallery canvas (before painting on top of it) to prevent it from yellowing over time?  I'm planning to leave some parts of the canvas unpainted.</p>

CC BY-SA 4.0
2020-11-06T08:48:26.277Z
Do you mean to prevent the canvas from yellowing? Independent of the paint itself? Are you planning on leaving parts of the canvas shine through, or are you talking about the backside?
Joachim
CC BY-SA 4.0
2020-11-06T13:48:04.733Z
You would usually just paint on the canvas and add a varnish on top to protect the paint (and the canvas if there is any blank canvas left).
Lapskaus
CC BY-SA 4.0
2020-11-08T09:00:37.803Z
@Joachim yes and yes. I’m planning to leave some parts of the canvas unpainted
Carlo Yu
CC BY-SA 4.0
2020-11-09T19:43:57.410Z
I'll post this as a comment because it's speculation.  You can slow down any yellowing that will occur by sealing the surface of the canvas with something clear.  But if it's going to yellow, it eventually will.  I suspect the solution is to coat the surface with something white and opaque.  There are low viscosity finish materials that won't change the surface texture if that's important.
fixer1234
CC BY-SA 4.0
2020-11-12T00:58:17.373Z
Are you using "raw" canvas, or "white" canvas that has already been prepped for acrylic (with e.g. a couple of layers of gesso). Because the former will tend to yellow regardless of your efforts to seal it, even if you seal both sides, whereas the latter will stay white for longer (depending on the quality of the gesso)
Gwyn
<preservation><acrylic-paint>
Preparing Canvas to Prevent Yellowing Over Time?
Carlo Yu
# Preparing Canvas to Prevent Yellowing Over Time?

(Asked by: username_0 on 2020-11-05)

What coat can I apply on a gallery canvas (before painting on top of it) to prevent it from yellowing over time? I'm planning to leave some parts of the canvas unpainted.

**Tags:** preservation, acrylic-paint

> **Comments:**
> **username_1**: Do you mean to prevent the canvas from yellowing? Independent of the paint itself? Are you planning on leaving parts of the canvas shine through, or are you talking about the backside?  
> **username_2**: You would usually just paint on the canvas and add a varnish on top to protect the paint (and the canvas if there is any blank canvas left).  
> **username_0**: @username_1 yes and yes. I’m planning to leave some parts of the canvas unpainted  
> **username_3**: I'll post this as a comment because it's speculation.  You can slow down any yellowing that will occur by sealing the surface of the canvas with something clear.  But if it's going to yellow, it eventually will.  I suspect the solution is to coat the surface with something white and opaque.  There are low viscosity finish materials that won't change the surface texture if that's important.  
> **username_4**: Are you using "raw" canvas, or "white" canvas that has already been prepped for acrylic (with e.g. a couple of layers of gesso). Because the former will tend to yellow regardless of your efforts to seal it, even if you seal both sides, whereas the latter will stay white for longer (depending on the quality of the gesso)  

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## 2 answers

### Answer by username_5 on 2021-08-12. Score: 1

If you want the canvas to be raw it will discolor but if you want it to look raw and are ok with covering it, then use a good quality acrylic gel medium. Golden makes several, and if you use a matte gel and cover both sides of the canvas you will not have any yellowing as it will be insulated from oxidation. Matte, is suggested because a thin coat is almost impossible to see. Gloss will show itself.


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### Answer by username_6 on 2021-01-29. Score: -1

The quick fix is a sealer so the tannin or stain can't penetrate through. Stain blockers that are oil-based primer/paints, spray shellac, polyurethane, or even wax.


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