s. islander, superb job on that Plasticville station. You might never guess that was the kit you started off with. Over the years, I've seen some really ingenious structure undertakings that started off with Plasticville structures. That would be another one. Again, impressive.
Most of us have had Plastcville buildings on our layouts at one time. A lot of us still do, therefore we all know what they look like. So it always brings a smile to my face to see someone take a structure that we all are familiar with, and turn it into something different and unique.
I always tell people who think they might be interested in doing some train car kitbashing and/or repainting, a good place to start off and hone your skills is with Plasticville buildings. Beaters and ones missing parts are not that hard to find.
I prefer Krylon spray paint, but like George above, have used the newer Rustoleum colors too. As George pointed out, it would be not as much as disappointment to make a mistake on a cheap Plasticville building, versus a more costly train car or engine... unless that was a bona fide beater too.
Different brands of paint (and even differing colors within one brand) have different drying times. As George pointed out, follow the instructions. Because once you start putting effort into a project, most of us want to see successful end results for our time and trouble.
I'll add to George's method: I always start with a grey primer as I want buildings (or train cars) to not let lights show through them. Then, if I plan on painting the structure or train car a lighter color like yellow, I'll do a coating of white primer over the grey. Some of the lighter colors like yellow, take more coats of paint for a good covering.