When you are sure the EP is cool, use acrylic paint to cover it. A medium coat is best - not globby and not to thin that you can still see the print.
This is very important! Wait until the paint is completely dry if you want a solid background. Mine turned out fine but it looks more worn... This looks cool too but may not be the effect you want.
Here is the result! Pretty cool I must say. The card I posted yesterday (grunged butterfly) used this technique and I will soon be posting another example. For a different look try using a patterned paper. I would suggest a small pattern for best results especially if your image is detailed.