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I noticed today that the top lid might have small beginnings of rust bubbles, very small bubbles under the paint. Bubbles are located under the top handle.
When I bought my WSM back in 2005, it had some chips on the lower edge of the dome. Weber sent me another one. While I was waiting on it to arrive, I put some black high temp paint on the chipped area and used the WSM. About 2 smokes later the black paint was also sealed with a thin layer of smoke deposits as well. Still have that replacement dome new in the box in the basement. Been using the "chipped" one since day one.
Same thing for the door. Where they stamped those ridges in had a crack along one edge. When they sent the dome they also sent a new door. I finally used it to make the e-WSM mod last year.