Can I use cans of spray paint to paint my old beater truck?

I bought cans of primer and black gloss (in 1) at walmart for $4 a can. I have an old beater pickup I got for $900, and needs some new paint. Will this do the trick? I've sanded down all my rough spots, so I might give this a try. I know it won't look great, but is there a better option I should try? (<$150)