The base model for NS #7129 is an Athearn GP60M in BNSF livery. The first step is to strip the paint from the model, so that detailing can begin. I use 99% alcohol to remove the paint, this is a plastic safe way to strip the paint from models without damaging the shell, but it should always be done in a well ventilated area. I work outside when stripping models.
I seal the model in a tupperware box overnight as a first step. Here's how things looked this morning, as you can see there is no apparent change to the paint, sometimes it will peel off without any help, but as this particular bottle of alcohol has been used a few times, it is a bit diluted.
Despite looking untouched, the paint is actually already softened, and should start to lift off the model with some rubbing. I use thick rubber gloves when handling the parts in the alcohol. The paint tends to remain in the grooves and detail areas of the shell.
An old toothbrush is the ideal tool to use for scrubbing the model, and after a minute or so the shell looks like this, the paint is removed from the majority of the long hood and walkways. The paint around the pilot ends and steps is not ready yet so I've sealed the shell back in the tub for a few more hours to finish the job. I have found it can take a couple of days to loosen all the paint, especially on the modern factory paint. Older 'blue box' paint comes off more easily.
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