For Cyanotyping you have to use a absorbent surface ao when you paint the liquid on it absorbes into it so you get a good picture, it also needs to not break up when you wash the liquids of. When you apply the liquid you need to apply it to the paper of fabric evenly without any bubbles or puddles of liquid on the paper or fabric.
When you expose the image it can vary the time you need to put it in UV light for, if its very sunny it will have to be out for a short time, if its dark it needs to be out for longer because there wont be so much UV light.
When choosing an image to make a cyanotype out of you need to chose an image with lots of contrast so that it will show up.
I think I might try cayanotyping my Final Piece and see how it looks.