I'd heard that you can use talc or cornflour to make texture paste but I wanted a rough grainy look, so I went with bicarb (baking soda) - I guess salt would work too and maybe seasalt would react interestingly with any ink. (mmmm something to try later I think) I mixed the bicarb with a little white acrylic paint and PVA then slapped it on through a tyre tread mask from That Special Touch. I oversprayed the dried paste with various inks and micas - in real life it looks very oil on water/muddy which was what I was going for.
UPDATE
Tried seasalt - very bad idea, but cornflour makes a really nice fine paste.
Very clever! I hope everyone reading the blog gives it a go!
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