We ran out of the West System epoxy hardener, so I used some old FAST hardener I had laying around. Probably at least 6 years old and it had been opened, but it seemed to work fine. It's the dark material in the photos.
Few hours later I came back and hit it with the Surform file. It's really important to do this at this stage, because a day later the epoxy gets a lot harder and it's more difficult to work.
To my dismay I may have a few low spots. Maybe I'll try some spare use of the fast hardener just to get me by.
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