Sorry for the rubbish title for this post, I couldn't think of a better way of putting it!

I made a couple of pendants and put them the wrong way up in the kiln so they were resting on their bails which squashed under the weight of the front of the pendant. I have saw the bails of and hammered the pieces perfectly flat but its very lumpy bumpy now. Can I layer on some slip untill it's all even and refire? I'm afraind if I file/sand the pendants will be too think by the tiome they are smooth on the back.