Sealing your mast from water

Discussion in 'Downeast Boat General Discussion' started by pennh2o, Nov 16, 2017.

  1. pennh2o

    pennh2o Senior Member

    Joined:
    Dec 18, 2013
    Posts:
    147
    Likes Received:
    10
    Location:
    Brooklyn,NY
    I want to seal the hole where wires enter in my mast. Every time it rains or there is a lot of spray, water drips into the wheelhouse where the clump of wires exit.

    What is the best way to go about this?
     
  2. Blitzen

    Blitzen Captain

    Joined:
    Sep 1, 2011
    Posts:
    3,266
    Likes Received:
    1,690
    Occupation:
    Ex Merchant Marine
    Location:
    Sumday Isle, RI
    Boat Make:
    1991 Boston Whaler Outrage 19
    If you have a picture it may help show us how the water may be getting in and what could be used.
     
  3. SeaKarma

    SeaKarma Senior Member

    Joined:
    Apr 26, 2014
    Posts:
    275
    Likes Received:
    385
    Location:
    Merrimack River, MA
    I took a hole saw to some plywood which gave me a round plug, then I wrapped it in shipping tape and waxed it. I used this to mold a small fiberglass cylinder, which I put into the canopy so that the entry hole stood a little proud of the canopy surface.

    This cylinder fits into the hole on the radar mast. I haven't tried this out yet as my boat is yet to see water, but it seemed to make sense to me.
     

    Attached Files:

  4. Genius

    Genius Captain

    Joined:
    Feb 11, 2016
    Posts:
    1,867
    Likes Received:
    727
    Location:
    Rhode Island
    A pad and a small coaming piece like shown above works good for the mounting. At the mast/radar mount I use a grommet for wire protection with a glob of clear silicone. Having an exit point at the bottom of the mast is also important.
     
  5. Old Mud

    Old Mud Captain

    Joined:
    Sep 9, 2012
    Posts:
    3,587
    Likes Received:
    2,757
    Occupation:
    Retired Fisherman
    Location:
    mid coast Maine
    Boat Make:
    Ho Made
    I did the same as SeaKarma except i used a piece of PVC and stood it up 3 " through and a 1/4" hole in the aft of my mast. Never had a problem.
     
    NightBite likes this.
  6. Hammer Slammer

    Hammer Slammer Senior Member

    Joined:
    Sep 7, 2011
    Posts:
    296
    Likes Received:
    102
    Occupation:
    Builder
    Location:
    Plymouth, ma
    Boat Make:
    31 Duffy
    I used a thru hull from the bottom up and just cut the extra off
     
    morgan1727, Old Mud and Tunatown like this.
  7. Toolate

    Toolate Captain

    Joined:
    Aug 6, 2013
    Posts:
    5,306
    Likes Received:
    1,422
    Occupation:
    Building contractor
    Location:
    Southwestern CT
    Boat Make:
    1998 36' Sabre Express CAT 3116TA's, 2015 ROS Scotia 16 Etec 50
    If you can loop the wires in such a way as to make a drip loop with a low point that is not over the hole in your roof it might help. Simple as pulling back some slack and arranging it so the water drips where you want it to as it runs down the wires.
     
    SeaKarma likes this.
  8. pennh2o

    pennh2o Senior Member

    Joined:
    Dec 18, 2013
    Posts:
    147
    Likes Received:
    10
    Location:
    Brooklyn,NY
    Took me a forever but here is the mast
     

    Attached Files:

    Dr Dude likes this.
  9. JimRP31

    JimRP31 Captain

    Joined:
    Oct 21, 2011
    Posts:
    1,111
    Likes Received:
    255
    Occupation:
    Sales
    Location:
    tiverton RI
    Boat Make:
    Willis Beal/RP 31
  10. Blitzen

    Blitzen Captain

    Joined:
    Sep 1, 2011
    Posts:
    3,266
    Likes Received:
    1,690
    Occupation:
    Ex Merchant Marine
    Location:
    Sumday Isle, RI
    Boat Make:
    1991 Boston Whaler Outrage 19
    Quick and easy would be to pull some slack in all those cables so the water would not run right down the cables and into the mast. Then cover the the hole with a clam shell cover.
     
    Pitou, Toolate and Genius like this.
  11. pennh2o

    pennh2o Senior Member

    Joined:
    Dec 18, 2013
    Posts:
    147
    Likes Received:
    10
    Location:
    Brooklyn,NY
    whats a clam shell cover?
     
  12. Blitzen

    Blitzen Captain

    Joined:
    Sep 1, 2011
    Posts:
    3,266
    Likes Received:
    1,690
    Occupation:
    Ex Merchant Marine
    Location:
    Sumday Isle, RI
    Boat Make:
    1991 Boston Whaler Outrage 19
    Find one like this that fits over the hole and the wires.
     

    Attached Files:

  13. Blitzen

    Blitzen Captain

    Joined:
    Sep 1, 2011
    Posts:
    3,266
    Likes Received:
    1,690
    Occupation:
    Ex Merchant Marine
    Location:
    Sumday Isle, RI
    Boat Make:
    1991 Boston Whaler Outrage 19
  14. Toolate

    Toolate Captain

    Joined:
    Aug 6, 2013
    Posts:
    5,306
    Likes Received:
    1,422
    Occupation:
    Building contractor
    Location:
    Southwestern CT
    Boat Make:
    1998 36' Sabre Express CAT 3116TA's, 2015 ROS Scotia 16 Etec 50
    You definitely need to pull some slack back on those wires and make a drip loop too. A few have said it but here is a pic of what we mean just in case. Rain or spray will run down the wires from the radar and then have to drip off because the wires will then run uphill into the clamshell/hole.
     

    Attached Files:

  15. pennh2o

    pennh2o Senior Member

    Joined:
    Dec 18, 2013
    Posts:
    147
    Likes Received:
    10
    Location:
    Brooklyn,NY
    Thanks guys, very helpful.

    Will make a drip loop and add a clamshell plate with silicon. Hoping should do the trick.
     

Share This Page