I’ve been experimenting with dry brushing over textured surfaces. One thing I’ve dried is adding some tooth to the surface by mixing pumice with acrylic medium. I know you can get prpared product like this but for cost reasons I want to mix my own. I bought some pumice from a company sells pastel supplies, but it’s too fine, there isn’t much texture there.
Can anyone recommend a source for pumice powder and a good grade to use?