Do you have a kitchen blender?
I must admit to having reactivated some very old military paint by adding the proper thinner/reducer and mixing like hell. Yup I've even used a blender. While I have never painted a vehicle with it I have done touch up and new parts with pretty good results. The blender works really good on turning that lump of flattening compound into use-able compound again.
Obviously what you are looking to do is restore the proper viscosity and to strain out any lumps.
Cheers
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