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I have a slight problem that I thought you guys might be able to fix. I've been painting locos recently and I have had the paint start to rub off. It only rubs off on the corners and edges. I have a glosscoat(future acrylic floor finish) on there and it still rubs off. I am using Badger Modelflex paints. The shell that it is rubbing off of was stripped in 91% alcohol, and then washed with soap and water before painting. The color that is rubbing off is engine black.
Any ideas as to why it is rubbing off? I would post pictures of it except I already painted over it again with the black. If it starts to rub off then I will post pictures of it.
I would second the primer solution. It certainly looks like an adhesion problem.
In my time as a taxi owner, I had to do plenty of touch-up work on car doors. Right along the edges where it's tough to get paint to stick. The only thing that worked was a good primer before painting or the paint would just flake off. It also involved sanding, but I wouldn't suggest that on the model.
The water-based ModelFlex paints don't seem to adhere as well as solvent-based paints or even other brands of water-based paints. I know I ran into a bit of a chemical conflict once when I painted a model with acrylic airbrush paint (the pre-thinned craft store stuff) and then sprayed it with Dullcote, but I can't remember for the life of me what it was on
I'd have to agree with the rest of the gang though, try a primer (I don't recall you using one in your step-by-step thread, but I could be wrong).
I've also had this problem before, although on a smaller scale. It was the engine black for me as well. I found that it only happened on models that I did not paint primer on, where the paint would go directly on the plastic. Now I use SP Letter Grey for primer and it works great. However, nowdays I usually paint a locomotive that is already painted, which also works as a great primer.
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