I bet I increased the value of my Stevens 223 when I painted it in snow camo!

It was a butt ugly gun to begin with, and now it looks cool.

And hell, for $300, what is th eresale value anyway? $150?
I woujldn't paint one of my expensive and/or custom rifles ( other than the stock) with Krylon, but I wouldn't get it coated by one of the expensive coating companies either. The stainless and synthetic hold up pretty good without the coating, anyway.
I am sure that the expansive coating comapnies do a good job, but I can repaint my Stevens 100 times in different patterns and colours for what one coating woudl cost.

If I have to strip the paint and repaint once a year, it's not a big deal. I doubt I will have to repaint for a couple of years at the minimum, though.
How well the paint adheres relaly comes down to prep work and how you treat your rifle. If you rough up the surface a bit, and degrease, the paint will adhere much better. Todbartell has used his rifle that I painted alot, and he has reported zero chips or scratches.
I didn't pain the internals or the bolt of the Stevens, as I don't see the point.