Objective: What supplies are needed to make a rainbow metallic wall art set?

Which of the following solutions is more sound in terms of naive physics reasoning?

Pick from:
(i) Multiple canvases Newsprint/paper to protect the floor Paints of your choice (I used Artist's Loft 12-piece Metallic Acrylic Paint Set and DecoArt Elegant Finish Glorious Gold DA071 Metallic Paint) Paintbrush Cup of water Paper cup for diluting gold paint;
(ii) Multiple canvases Newsprint/paper to protect the floor Paints of your choice (I used Artist's Loft 12-piece Metallic Acrylic Paint Set and DecoArt Elegant Finish Glorious Gold DA071 Metallic Paint) Paintbrush Cup of steam Paper cup for diluting gold paint;
(i)