Once you have a nice color coat it’s time to decide on the
graphics (if any).  Graphics can be anything from just labeling
your knobs “volume”, “fuzz”, “boost”, ect. to giving your pedal a
name, a logo, or anything you want.  There are many different
ways to add graphics to your pedal.  The best method of course
is silk screening, but that will probably cost you more than the
pedal itself if you don‘t already have the tools and supplies.  
More feasible methods include hand painting, inkjet water-soak
decals, and just writing on it with a permanent marker.  If you
want to use permanent marker and you also want to add a clear
coat, you should do the marker last as the solvents in the clear
coat will make the marker run.  If you want to hand paint your
graphics, I would definitely recommend adding a clear coat
because they tend to chip very easily.  I personally prefer inkjet
water slide decals.  These are decals that are about as thin as
the skin of an onion that you print off your computer with
whatever desktop publishing software inspires you the most.  
They have a paper backing to them.  When you are ready to
use them you must first spray them with a clear coat and let dry.  
Then cut them out, soak them in warm water for about 15-30
seconds (depending on the size of the decal), then slide them
off the paper backing and stick them on your pedal.  I find this to
be the most economical way to get professional looking results.  
You might be able to find some decal stock at a nice hobby
store (one that has RC planes and model trains) Much like hand
painting your graphics, you will need to add a clear coat if you
are going to use water slide decals because they will rub off
quite easily.

Clear Coat

     There’s not much difference between applying your clear
coat and your color coat.  Use light “dusting” coats.  Read the
instructions for that particular brand of paint.  Once again I
prefer enamel based spray paint, but acrylic is fine.  The biggest
difference between the clear coat and color coat is that you
CANNOT bake the clear coat if you have water-soak decals
underneath.  You must wait for it to air dry.  If you bake it, it will
get bubbles in it.  If you didn't use water slide decals between
your color coat and your clear coat then it’s OK to bake it.