What paint do you guys use on exhaust manifolds?

The first time I painted the manifolds on the 340 in my '74, I wire brushed them and sprayed them with the cheapest paint I had on hand (walmart paint 99 cents a can) and then they sat around for 6 months before I had the car running.

That paint stayed on for over a year (after the car was together and driven) before it started to rust. When I had the engine out over the following winter (for upgrades) I sandblasted the manifolds and sprayed them with 1200* Engine Paint. They rusted within a month of driving the car

Similar experience, I sprayed the exhaust on my Yamaha DT175 with 1200* Engine Paint and it rusted within a few months. So I wire brushed the whole exhaust and sprayed it with cheapie walmart spray cans (99 cents again). It baked on (from riding the bike) and hasn't rusted yet (been on the bike for several years)