Once dry, I flipped them over and painted the insides. Once that dried I painted both sides with some matte clear coat and then let them dry overnight. The clear coat isn't totally necessary, but it will make it easier to paint on the details with acrylics.
The next morning I used a pencil to lightly mark the details I was going to paint in.
Once all the paint on the green mask dried, I added the 2 black details to the chin.
And this one is done!
Next I brought the masks in the garage for a few coats of glossy clear coat.
The next morning I repeated the previous steps and repainted the green mask.
When the paint was dry I reapplied the clear coat, this time making many light coats until it was nice and glossy. Thankfully there was no shriveling this time.
And I'm done! I carefully packed them up and shipped them to Kerrie and Scott. A few days later they got the masks, and the kids loved them. "Carl" even decided to wear his while in bed reading.