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Whiteness of polyester canvas

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​Hello
I’m currently painting with acrylics on polyester. The paint sticks beautifully. I’ve noticed that the polyester cloth is much whiter than my titanium white paints/primers. Compared to the fabric, titanium looks darker and yellowish. Maybe the material contains some optical brighteners – I’ll try to find out.

​I’d like to utilise this cool white cloth for bluish paintings. I need to prime the surface to even out the texture – but any pigmented primer would kill that whiteness. I’m thinking of preparing the surface with a clear primer, thus preserving the expressive tone of white. I quite like the matteness of Amsterdam Heavy Gel Medium. If I prime with it, will it yellow over the years?

Thank you!

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All organic coatings will yellow to some extent including high quality acrylic dispersions. I have seen very thick clear films of acrylic medium which possessed a slight amber hue. This is an extreme situation, though. As long as the film is very thin, the color of the canvas would likely remain.
Like everything, though, you should do tests before trying this on your artwork.

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