I have approximately 1500 feet of rusty pipe fence to paint. Rusty but not pitted. Needless to say, I would like this to last about 10 years. I need some advice please on what I need to use, i.e. OSHPO and Rustoleum or OSPHO, primer, Rustoleum or something else. I live in central Texas so mainly hot & dry weather. There are so many types of paint that it's hard to sort through them and I'm affraid to go to a store and only get biased info about their product. Thanks in advance for your help.