Blending paint is a skill that you will continually improve as you paint more and more rocks. I personally love using paint pens and have shared many reasons why I think they are great for beginners. If you choose water-based pens you can actually blend with them! This is how we created these beautiful blended rainbows.
You know we have quite a few rainbow rocks on our site. What can I say, I love rainbows! They are always favorites when they are found so I just keep on making them. Getting a nice bright rainbow on your rock can be tricky using acrylic paints. So I prefer to create mine using my paint pens!
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Step by step instructions for blending paint pen rainbows
Which size of pens you use really depends on the size of your rock. There are quite a few different options as far as tip size with Poscas. I started with the multi-pack which had 1M, 3M, & 5M. You can check out lots of different options for paint pens here.
There is also two different methods you can use depending on what you are most comfortable with.
For the first method lay down a stripe of each color of your rainbow. Get them close together without touching.
Then take a brush, dip it in water, and dab off most of the moisture. Wiggle it in the seam between each color.
I like to do my lighter colors first. If you pens have dried too much just add a fresh line of each color and then blend. Work your way over each color and you are done!
The second way you can blend paint pens is with the pens themselves. Again, place each color of the rainbow onto your rock.
This time, once the first layer has dried, you start with a second layer only layering the two colors where they meet in the middle. You will get some of the second color on the tip of your pen, but you can just doodle it off on a piece of scratch paper.
You can see both of these processes entirely in the video below!
How to paint a rainbows on rocks with paint pens!