This little guide will show you how to paint your skateboard with some pro results. I documented myself painting a skateboard 3-4 years ago (bad camera), but you can see what's happening to get an idea of what to do. I hope you learn from this, comment if you like it.
Step 1: Prep
Step one is basic prep. First, you wanna remove the trucks/wheels from the board. This is mandatory, because painting these on the board never works out the way you think it would. If you wanna paint your trucks, it's best to remove them from the board. But if you are just painting the board, remove them anyway.
Sand the board (when I took the photos, I did not sand it, so I do not have any photos for this). This will help the paint stick to the board, and if your board is chrome/shiny like mine was, it's a must. You normally use 400 grit sandpaper for this. Sand the paint/design/chrome off, and your good to go.
When your finished, wash the board with some soap/water, or even better, grease/wax remover. This will remove any grease or oil on the board. When the board is clean and dried, move on to step 2.