Ok, maybe tacky wasn't the right word. I didn't mean to offend!
The reason I want them smooth is so we can glue little things to the pictures (like reinstones). The domes are hard and I wouldn't be able to put those over the image if it wasn't completely flat.
Do the domes stick well (if we decide to do something with just a photo) or do you add a little superglue or something extra to make sure they stay on?
I still need to know what people are using to "coat" or "go over" ones without resin.