...Is that Rustoleum paint any good?...
Rustoleum paint is not as good as it was many years ago and there are better products
now. The industrial grade Rustoleum with the primer already mixed in does seem to
hold up better. There are may brands of rust eating product such as what Anole
mentioned that work very well.
Some of the best coating product I have ever used is called POR-15!
It is used a lot by people restoring cars and I have used it over rusty truck frames
and it holds up super even up to something called "road salt" which Erie county in
the state of Pennsylvania is like the biggest user of in the country for melting snow!
The POR-15 comes in colors but the high gloss black looks the best but will fade
if you do not use their UV protecting additive. I stay away from the high gloss black
and use a regular black which still looks great. I have used the product without all of
the fancy primers (And my friends have too!) and it still holds up great. It is available online,
paint supply stores but the best place to get it is at car shows. The usually have a great display
of all the products and usually a "before and after" rusty car frame or some other parts.
The price is usually cheaper at the car shows too!!!
http://www.por15.com