Butyl tape is a good sealant but not a good gasket. For any component taking a tensile (or compressive) load to the deck, if butyl tape is used, it will ooze out of the joint under compressive loads and allow a gap to be created under tensile loads--this is what makes it a poor gasket. A good gasket recovers when deformed--elasticity is what allows the recovery.
Butyl tape is great for mounting hatches etc. where there are no tensile or compressive loads being transmitted except clamping loads. Bob Bob Boyer S/V Rainy Days / Annapolis MD 1983 C&C Landfall 38 - Hull #230 email: dainyr...@icloud.com blog: dainyrays.blogspot.com "There is nothing--absolutely nothing--half so much worth doing as simply messing about in boats." --Kenneth Grahame > On Oct 15, 2015, at 8:50 AM, Marek Dziedzic via CnC-List > <cnc-list@cnc-list.com> wrote: > > There is a split opinion on using silicon on deck hardware. I believe that > butyl tape is best. But not all butyl tape was created equal. If you want to > go that way, I suggest using Compass Marine (I think $25 for 2 rolls that > would let you bed the entire deck to hull joint). > > Marek > Ottawa, ON > > From: Tim Goodyear via CnC-List > Sent: Thursday, October 15, 2015 8:42 AM > To: cnc-list@cnc-list.com > Cc: Tim Goodyear > Subject: Re: Stus-List rebedding hatch > > For a different opinion; 3M 4200... I used Lifecaulk when replacing Mojito's > hatches about four years ago and it worked fine, but have been using 4200 for > all deck hardware since on advice from a couple of yards. > > Tim > C&C 35-3 Mojito > Branford, CT > >> On Thu, Oct 15, 2015 at 8:14 AM, Joel Aronson via CnC-List >> <cnc-list@cnc-list.com> wrote: >> All, >> >> I'll be replacing the front hatch with a Lewmar hatch. Which sealant should >> I use? Sikaflex, Lifecaulk, something else? >> >> I need to overdrill, epoxy and redrill the new screw holes, correct? >> >> Joel >> 35/3 >> Annapolis >> >> >> -- >> Joel >> 301 541 8551 >> >> _______________________________________________ >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go to the bottom >> of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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