MechaPaint
Blender's texture paint mode works, but it fights you: image slots, node setup, no real layer stack. MechaPaint is a dedicated painter, export your model, paint it with tools that behave like the 2D apps you know, and bring clean PNGs back onto your own UVs.
Every tool unlocked. Exports are watermarked until you buy.
A full layer stack per material: paint on layers, adjust opacity, merge, hide, import an image into any layer. Undo follows the Photoshop model with a hard floor at your imported textures, no node trees, no image-slot juggling.
Export FBX, OBJ, or glTF from Blender; your existing textures load onto the base layer and every material becomes its own paintable submesh. Export writes PNGs on your UVs, drop them into your Blender materials and everything lines up.
Keep the UVs you carefully cut in Blender, strokes crossing island boundaries are dilated past the seam automatically, so there is no hairline gap. And if a map is beyond saving, Rebuild UVs generates a clean layout and remaps the textures onto it.
X/Z symmetry with true mirrored reflection, a mirror brush for copying a good side over a bad one, and a 3D clone stamp that samples anywhere on the mesh. Projection-paint reference images straight onto the surface.
File > Export > FBX, OBJ, or glTF. Drag the file onto MechaPaint, materials and existing textures come with it.
Layers, brushes, patterns, symmetry, and clone stamp, all directly on the surface. Your source .blend is never touched.
Export PNGs per material and plug them into your Blender shader nodes. Same UVs, so it just works.
Buying unlocks watermark-free exports.