Draw your design on the card stock. Immediately sprinkle embossing powder on the surface. If you work fast enough you will see that the powder has stuck to the wet ink. (with glossy paper you can work slowly)  Shake off excess powder from the paper and then proceed with your design.

You can do this a few times before applying the heat. Cover the entire paper surface with the gel metallics leaving only borders around the design for an enameled look. Apply heat about 2 inches away (check your heat gun's manufacturer's instructions) from the paper and watch the embossing powder melt on the surface and the metallic ink will shimmer through the clear embossed surface. This will take just a few seconds, and then it will harden quickly.

You can embellish cards or journals or anything that will take a thermal embossing technique. You will find that the weather, paper absorbency and your own writing or drawing style will determine the time in which you have to sprinkle the powder before the ink dries. You will have to experiment!