Topband: Waterproofing a tupperware - drainage & advice

[Gary Smith]

Rather than invent a poorly designed 
wheel, maybe someone here has already 
successfully worked out a better solution 
to waterproofing.

I am using a Sterilite 25" x 18" x 8" 
container with secure snap on fasteners on 
each side of the lid to house the outdoor 
electronics for the 8 circle array. The 
lid fits wonderfully and there is a 1" rim 
that comes down from the lid to secure the 
contents from exposure to rain.

I have drilled the holes for each coax (9 
in all) and cut a slot for the control 
wire. I'm planning on wrapping each coax & 
the control cable with plastic from a 
plastic bag to make the coax snug to the 
hole and then gorilla taping that to the 
side of the container on each side.

Any ideas to improve this?

Another option I've thought of to seal the 
openings is to use expansion foam to seal 
the holes. My concern is that is that I've 
never used this foam before and don't know 
how easy it is to remove it from the coax 
should I ever need to. Seems like it would 
make a great seal.

Any caveats using the foam instead of the 
plastic bag & gorilla tape?

Another consideration is drainage; the 
container will be placed on a large 
boulder to keep it above rising salt 
water, should there be any from a 
storm/hurricane. 

I don't want to make access holes for 
insects but I need to keep it dry inside.
Once the holes are sealed there isn't much 
access for water getting in. Murphy being 
a McGuiver, should I drill a couple small 
holes in the bottom for drainage or should 
I leave it as is and not provide for 
drainage?

73,

Gary
KA1J