Engine and header paint

The middle of last summer I did my race headers with VHT header paint. First they all scuffed down, then they cleaned with a degreaser and since the are Hedman Husler headers they come apart and allow you to fit them in an oven. Followed the instructions on can temp to bake at 350 ?? for 20 minutes then whatever else the directions said. At first I thought they were going to hold up well, but I was disappionted and the paint didn't hold up at all.