O
I'll put my money on the nails rusting whether the heads are plugged
or not.

My choice would be epoxy thickened with micro-balloons.

Nail will probably still rust, it will just take longer.


Lew


Agreement on the epoxy only because it will flow and bind with the
wood better than Bondo and has a bit more flex for
expansion/contraction. The nails will still rust because that's what
iron nails do reguardless where they are.

Pete