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Rusty texture technique ("DIY Rust Paste"); this is a technique for making an embossed or bas-relief surface look like it is all rusty and neglected. It is a multi-layer technique, not just a single application of a paste to make things look rusty. It requires dark brown (Burnt Umber) paint and rusty-brown (Burnt Sienna) paint for the under-layers; these have a texture powder added to the paint to give it... texture! If you can't get the grit powder, cinnamon will do (it's bark, it isn't going to dissolve or go rotten). Other paints are then added in more layers to get a metallic and patina look.

Pretty thorough introduction to acrylic pour (fluid art) techniques. This video covers techniques on how to prepare your canvas, puddle pouring, dirty pours, funnel pours, flip cups, swipe / spreading, surface dipping, and more.