Using tape and starting in reverse to drill a neat hole through gel coat is good advice. Depending on where you drill, you might get balsa core, especially above the waterline (not sure if the 35 has a cored hull) I don't think silicone has any place on a boat. I'd use Sikaflex. (I'm not keen on butyl either - my deck to hull joint is butyl and it drips everywhere!) Why a 1 1/4" hole for a 1 1/8" fitting?
sam :-) C&C 26 Liquorice Ghost Lake Alberta Original Message From: Steve Thomas via CnC-List Sent: Wednesday, April 5, 2017 10:59 AM To: cnc-list@cnc-list.com Reply To: cnc-list@cnc-list.com Cc: Steve Thomas Subject: Re: Stus-List Drilling a Hole in the Hull 3M 4200 will work, but if the fitting is plastic, chances are you will be replacing it again someday. 4200 is not as difficult as 5200, but neither is easy to remove. Above the waterline through hulls are the only place that I use silicone. Polysulfide (Life Caulk) would probably work, but there is a caution about its use with plastics, and I don't know why. All of the plastic tank vent through hulls, the shower through hull, and the electric bilge through hulls needed replacement on my C&C36. Southern sunshine! Steve Thomas ---- Thomas Delaney via CnC-List <cnc-list@cnc-list.com> wrote: Hi listers, Thanks, everyone, for your advice on the solar charging system and ACR. Onto the next project! I'm going to be drilling a hole in the hull to install a well-above-the-waterline thruhull for a bilge pump discharge hose. The thruhull is 1 1/8" inch, so I'm going to use a 1 1/4" hole saw drill bit. I'm going to seal it with 3m 4200. Does this plan make sense? Are there any surprises to expect? Thanks, Tom --- Snow Goose C&C 35 Mk I City Island, NY _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
