I have an ethernet cable that goes into house from the outside wall.

What sealant should I look for that will not crack the cable?

I need to keep wind and rain out of the house from the hole.

It has to be compatible with plastic.

  • mount a weatherproof enclosure on the wall outside and install an ethernet lightning arrestor in the box
    – jsotola
    Feb 9, 2019 at 1:27

2 Answers 2


I normally use a paintable silicone but with brick would use clear , silicone is what the cable and satellite company's used on my homes and I use it at work also for sealing small holes.

  • I personally would err on the side of the caution and stick to a neutral cure (oxime or alkoxy) formulation... Feb 8, 2019 at 23:39

I would suggest using some Great Stuff.

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