Mike Hummel's vacuum formed coin bank

After using 40 mil to vacuum form both halves I then attached them with using a small 40 mil strip. After they were attached I used spackle to fill in any cracks along the seam line. Unfortunately the spackle dried in an off white color when the styrene is bright white. I am now deciding if I should just spray paint the whole thing white or leave it how it is. Here are two pictures below.