Air Cleaner "Art" is done

I’m assuming that is vinyl decal?
If so, what do you do to prevent curling with engine heat? Originals were screen printed for that reason. But back then I’m sure the decals were not of the same quality they are now.

I asked the same question before we started the work. He assured me the he has done a few intake manifolds with no issues. I suppose I could spray the back of the tin with some sort of thermal barrier coating if needed, or use clear coat VHT over the top.