I bought this Magnolia sign this weekend. The sign is nice and shiny and there are few pops on the porcelain.

However, the sign is wavy...



I'm guessing this was in a pile of junk somewhere for years and years... Is it possible to straighten a sign like this without damaging the porcelain?

There's no stopping the Cretins from hopping
You've got to keep it beating for the hopping Cretins