I need some help guys. I am currently restoring an aluminum serial tag for a good friend of mine, but for some reason, the black spray paint isn't sticking. I have never had this problem before, so it's rather irritating! I was thinking about trying to bake the paint on, but I'm not sure what temperature to use, and I'm not sure if the aluminum will hold up to the heat. I've baked enamel paint to steel parts before, but never aluminum, especially aluminum this thin. The tag is off a hard to find tractor, so I have to be careful on what I do so that I don't ruin it. I'm sure my friend would be forgiving, but I don't want to travel that route if I don't have to.
This tag had some deterioration to it, and the lettering and border doesn't sit real high, so I can't apply to many layers of paint. I must keep the paint finish below the high spots of the lettering, in order to scrape the lettering clean. After the first coat of black, it didn't turn out real bad (the second picture) but it didn't suit me. I applied another thin coat of black, but now when I try to scrape off the paint from the lettering and the borders, the paint just peels or flakes off paint from where I don't want it to be removed. I have been letting the paint dry for at least three days. After painting the tag, I lay it on our radiator heaters so that the heat helps the paint cure faster. After the third day, I rinse the tag with warm water, dry it, let it sit over night, then start scraping. I don't understand why I'm having so much trouble with this one, as I never had this type of problem before.
Any and all help would be greatly appreciated.