Lettering removal proto 2000 hoppers


Doug Forbes
 

I have several black GM&O war emergency hoppers from Proto 2000.  I would like to remove the lettering and replace it with Illinois Terminal decals.  I have tried soaking the lettering with solvaset and separately with 91% isopropyl alcohol with no affect on the lettering what soever.  What do I try next?  Any suggestions would be appreciated. 

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