I have a local guy doing some work on my Lang 84D. He’s doing a little metal fab work to repair some missing metal on the diverter plat on the firebox end. About a 1/4 -1/2” gap. Pretty common for an older unit. Inside will be steam cleaned and racks as well. Outside is being completely blasted including the trailer and then repainted. I am really struggling with setting on on the paint to be used. He was recommending POR15 high temp heat resistant paint. On that someone said the following “You should read up on POR 15 first. It is designed as an engine paint. It may be fine but it is a urethane and can’t be painted over. It is reported to have a different expansion coefficient than steel which can lead to cracking when hot and leaving voids under the paint to rust. Because the firebox gets so hot, the paint may still burn causing it to crack. Then you may have limited options to maintain it.” I need to settle in on a good paint as he will be to that stage soon. I’m also debating flat vs semi gloss despite the fact Lang stock paint is flat. Seems to me semi gloss may be easier to clean. Lastly I’d like to do the trailer and cooker with same paint if possible. Any thoughts?