Paul,I like you was trying to save a few bucks on my paint job so considered rattle canning it,like the guys say it might not last,time will tell but on the whole i'm pretty happy with the results.
Sure it doesn't stand too close attention (it's a 20' paint job) but it'll do me for now.
Total invested approx $120 plus my own time.
Rattle can paint job. Another angle. 
