It depends.....
In general, I try to keep them as original as possible. But, sometimes, that just isn't feasible or possible. And, other times, I just don't like the look of it in the condition that I receive it.
I know that Danny (
@Nuvolari) and Brent (
@parallelmotion) have strong opinions on this subject; and for really valuable and rare engines, I agree that they should be kept as original as possible. Frankly, I don't have their skills and would leave important engines to them for restoration.
I have been working on a Bowman M122 for the last week. There are thousands of these out there. They are not particularly rare. But, they are well made and fairly easy to disassemble. I hated the bronze lacquer finish that was on the boiler and decided to make it all shiny and new. The base was in decent shape; so, I cleaned it and treated it with some car wax to protect the paint. I also made an exhaust pipe for it out of brass tubing.
I paid very little for this engine and did it the way I wanted to do it. I am very happy with the outcome. I am sure others will think that I ruined it.....
I will be posting a video and pictures soon.
Everyone has their personal preferences and I don't judge others for their choices. Each to his own!