The number of layers needed is driven by the weight of the cloth chosen and how thick the hull is there. I'd use 1708 as it is so easy to work with. It's two bias layers of 8oz roving stitched to some 1 1/2 oz glass mat. Measure the thickness of the hull after removing the thru-hull. Multiply that by 12 to mark a circle around the hole. Then grind a bevel from the hole out to the mark. Cover the hole from the inside with some mylar sheet, taped tight to the surface.
IIRC, 5 layers of 1708 yielded about 3/16" thickness, four or five layers is max I would lay up, then wait till it's tacky like an hour or so. Then lay up four or five more layers and wait for it to cool and get tacky and lay up more layers. I use peelply to draw off the excess resin with a fin roller and if you let it cure overnight with peelply, you can avoid sanding before applying more layers the next day. Repeat till the repair is higher than the surrounding surface and let it cure and grind flush. Here is a good video that shows some good tips for West System and 1708. https://www.youtube.com/watch?v=aSKbF6jGJKw&t=2009s Chuck S > On 03/24/2021 10:54 AM Shawn Wright via CnC-List <cnc-list@cnc-list.com> > wrote: > > > How many layers of glass should I be using on the outside for blocking a > through-hull? Glass on the inside also, or just fill with epoxy? Some of > mine have limited access on the inside for creating a taper. > > -- > Shawn Wright > shawngwri...@gmail.com mailto:shawngwri...@gmail.com > S/V Callisto, 1974 C&C 35 > https://www.facebook.com/SVCallisto > > On Tue, Mar 23, 2021 at 3:59 AM Dave S via CnC-List < > cnc-list@cnc-list.com mailto:cnc-list@cnc-list.com > wrote: > > > > If I get the math you are going from two through hulls to > one - I did the same and removed my overboard discharge at the same time. > > > > Why not eliminate the unused holes? It needs to be done properly > > for sure but it’s not difficult. > > > > Some pics here: > > > > > > http://cncwindstar.blogspot.com/2016/08/repair-of-keelhull-joint-closing.html?m=1 > > > > Dave > > 33-2 > > > > > > > > > Thanks to all of the subscribers that contributed to the list to > > help with the costs involved. If you want to show your support to the list > > - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > > - Stu >
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
