https://i.imgur.com/MFIfTme.jpgDoes it look like this I also had an issue with that paint but it is hard to trace down. So what happened with my 1000 was it ended up having a nat gas manifold they just stuck a regulator on it fired it up thing went past 700 and pretty much the lid sides were toasted. Ended up getting a propane manifold from another member on the other gasser forum.
However could have been other issues with that paint and it was in the prep, had done what I thought was a good job using simple green to degrease it and took care to rinse it but I did not wipe it down when I was done with acetone or denatured alcohol and I think this was an issue. Thru some searching I did recently I came across on a painting metal site that simple green can leave a slight film so it needs to be wiped down with a solvent before painting.
Because I was so unhappy just took the lid apart I have a performer also so was not without a grill. I took my wire cup brush and just took it down to pure metal as you know there is a texture on those lids and nobody has been able to replicate it. Then the usual used simple green and rinsed off then wiped it down with acetone. What I would tell you as I originally thought was the simple green and a good rinse was enough for prep it was not when I wiped it down with the acetone it still was picking up the remnants of that black paint I had wire brushed off.
I just sprayed them last week putting it back together use 900 degree caliper paint high gloss it is and a pain since like any gloss paints its multiple coats to get it to look a uniform gloss. I did not get them perfect but pretty good and it is grilling season so need to get her done. I can update the results in a few months if anyone is interested and I will take a picture of the way they turned out.
They have been using the rust ultra for many a restore over there personally I was not happy with it could be me being a lousy spray painter. But Jon has recently been trying the Krylon Paint which is more difficult to find but here is a link
https://www.mscdirect.com/product/details/00264853.
I wanted to try it myself I knew about it but my local HD and Lowes did not carry it.