ANASTASIA D KIERST
I have a cabinet door I'd like to do a cyanotype print on. It is painted white. I saw something somewhere hinting that by painting it first with a thinned gelatin, drying and then coating with the cyanotype solution, a print on a hard surface night be possible. Do you have and experience with this?
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Jacquardmod Jacquardmod
You can definitely do it on raw wood.  So, if you sanded the paint off, that would work.

You are talking about a gelatin print which is well known if photo world, and yes that should probably work.

I would also guess that a watercolor medium could act as a primer for this.  They have mediums that make any surface into a watercolro surface that makes a hard surface absorbent.  That would probably work for cyanotype.  

I think something like this would work quite well

http://www.gaylemahoney.com/blog/2017/4/8/using-golden-fiber-paste-medium-as-a-ground-for-watercolor
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