ink bleeding through paint

[hellebelle.livejournal.com]

i've started making a "money box" for my brother's wedding. i want to paint a cardboard box ivory white, but first i've painted it with 2 coats of white acrylic paint. the frustrating part is that the ink from the company's name that has been stamped all over the box is bleeding through the white paint. is there something i can coat the box with to stop the ink from bleeding through? maybe oil paint?

thanks craftygrrls & boys :)