I've heard good things about Cabot's. I used it on a cedar fence and it
held the natural look longer, but it still turned gray cuz I didn't have
a chance to recoat it a year later. Most stains/sealers do need to be
reapplied yearly to keep looking good, esp when it sits in the sun a
lot. But you may want to look into Cabot's anyway.
They do make bigger boxes.
If an electrician needs the space they will use a 4" x 4" x 2 1/8" box
with a mud ring, or 4 11/16" x 4 11/16". It is possible to overfill
these boxes, but you really have to try. Last I heard, these boxes could
also be used by homeowners.
I have the 22.5 cu. in. blue plastic boxes from Home Depot. The 18 cu.
in. boxes are too small IMO but the 22.5's seem fine.
I don't think there there will be any problem stuffing the 22.5 cu.in.
boxes with outlets and 12AWG wire/pigtails....
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