Hot selling prefab layer chicken houses steel structure automatic poultry farm

What kind of paint should be used for the maintenance of steel structures in hot selling prefabricated chicken houses and automated poultry farms?

1、 Primer+intermediate paint+topcoat: ordinary epoxy zinc rich primer+epoxy intermediate paint+various colors of aliphatic polyurethane topcoat (service life can reach 6-8 years).

2、 Primer+intermediate paint+topcoat: ordinary epoxy zinc rich primer+epoxy intermediate paint+various colors of chlorinated rubber topcoat (service life can reach 5-8 years).

3、 Primer+intermediate paint+topcoat: ordinary epoxy zinc rich primer/epoxy zinc phosphate primer/epoxy iron red primer+epoxy cloud iron intermediate paint+various colors of acrylic polyurethane topcoat (service life can reach 6-8 years).

4、 Primer+intermediate paint+topcoat: ordinary epoxy zinc rich primer+thick film epoxy cloud iron intermediate paint+various colors of chlorinated rubber topcoat (with a lifespan of 5-8 years, the difference from one situation is that this matching can increase the film thickness).

5、 Primer+topcoat: Red lead rust proof paint+various colors of alkyd enamel (with a lifespan of 2-3 years).