I JB'd my 1872 a year ago. I had "almost" through holes.
Looks good so far.
I did it on a warm day. The JB flowed real nice, giving a great surface finish.
For the vertical sides, I let the JB set for 30 minutes before applying. Again, I got smooth surface flow.
Hope you have access to a heated garage in MA, I spent a couple years in Wilmington.
If I would have had through holes, I would have used Fiberglas cloth.
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