Tonight, my project of making my Lionel Rio Grande Berkshire look like a DT&I steam engine has hit a snag. Last month, I asked Paul Gribbel what I could do about my project at the Chi-Town Union Station indoor train layout. He said I could scratch the paint off with a razor blade and get some styrene to form some parts that were on the DT&I Berkshires. So, I recently tried that with a razor blade cover to scrape off the Rio Grande logo and engine number. However, the paint only came off at an inch at the "G", and I realized the blade doesn't move easily on metal. *sighs* At least, my dad and I will be able to wash off the logo and number with some paint thinner that I picked up with a book about the DT&I diesel engines and some paints at the P&D Hobby Store. However, my dad warned me that paint thinner is very noxious stuff. So much for making it easy.
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Try 91% isopropyl alcohol (if you can find any), after trying many other ways, I found it works really well. Took off nuclear grade paint nothing else would touch.
Not sure if we have any isopropyl alcohol.
I use acetone from the hardware store; only good for your zinc or brass or other metal equipment. It will react with plastic.
Never found letters it wouldn't take off cleanly.
BUT - test it a bit on your paint that the lettering sits on - like at a corner or unseen area.
Typically it will not affect paint at all, but I seem to remember a piece years ago that had a paint reaction. I may be dreaming, though.
I use acetone all the time for this.
I use a fiberglass eraser to remove lettering when I am repainting. They work great to remove the lettering without removing the underlying paint. You can find them on Amazon for a wide variety of prices.
Rolland