Re: what can mix in2 acrylic paint in order to apply with knives and scrappers any1???
If you want to keep the translucency of certain pigments then one of the gel mediums would be best. Different brands have different textures. Matt gels are less shiny and might suit you better. If you are using opaque pigments marble dust will thicken up the paint but as has already been said, a good quality heavy body paint should work for using with scrapers or painting knives.
"I am not yet born; provide me, with water to dandle me, grass to grow for me, trees to talk to me, sky to sing to me, birds and a white light in the back of my mind to guide me."
From Prayer Before Birth by Louis Macneice.