Ceiling?  

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Author: Curious George   Date: 4/16/2025 1:11:06 PM  +0/-1   Show Orig. Msg (this window) Or  In New Window

Ah... yeah, I've seen that but not much at all. Looked like graphite from pencil lead.

Just never heard it called mud (and never really flew really old aircraft that would have that issue).

Thanks
 
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Better look at them box beams for cracks +2/-1 Murdockdacoon 4/16/2025 4:01:27 AM