Step 4: Painting
I use Triple thick acrylic sealer. I got it from the paint section and it comes in a spraycan. A little goes a long way, so spray light coats one at a time.
Now, you should be ready to paint.
Now you can add effects and greebles (greebles are misc. doodads that make it look more interesting)
After it is all painted you will need to seal it again. Depending on how rugged you want it, I would add 3-5 coats of sealer. (different brands give different results, so check the label).