wrong finish

i built a boat out of 3/4" cedar wood and tongue and grooved the joints and i varnished it with marine varnish. but last fall after i built it i took it to the river to see how it looked in the water and everything looked good except the knots had a little water seeping through them. so this spring i have sanded the boat back down to bare wood and what do i need to put on it for a finish so as the knots dont leak.

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Permalink Reply by Dave Z on April 6, 2014 at 6:06pm

Cute boat!  I would do a cheater coat of epoxy to seal it all, patch fill any knots with sawdust and epoxy mixed.  Then a light fiberglass cloth over it all.  4 or 6 oz. 

Permalink Reply by kenneth engledow on April 7, 2014 at 10:57am

i used exterior wood putty on the knots and so i figure it will take 8.5 linear yards of  50" wide fiberglass to cover it with a seam down the middle. but how much epoxy do i figure i need for that fiberglass amount.  i looked at several places to order it from, but couldnt find any where that lets yu know how much epoxy it takes a square yard to figure how much i needed to order. this is my first boat build, as  you all probably figured by now.

Permalink Reply by Lawrence E. Long on April 7, 2014 at 5:29am

Kenneth:  Nice looking little boat.  It looks like what some call a ":flat iron" skiff.  Most people have never seen a true flat iron that your greatgrandmother used to heat on a woodstove to iron clothes.  These skiffs are common here along the coast of Maine.  One of the problems with cross planked boats that are "trailered" and not left in the water to swell up is that they always leak for a while.  Our Swampscott dory required a week or so with 3 or 4 inches of water in it to  get tight.

I agree with Dave Z   FG/Epoxy  and paint the boat with exterior porch and floor enamel (lower cost)  or a good marine  paint such as Kirby's.  Varnish is too much work for me on a whole boat- you need 4-6 coats to do it right.  The epoxy must be protected from UV with paint/varnish.

Good Luck

Permalink Reply by Rojo on April 7, 2014 at 11:11am

West Systems has a formula to estimate amount of epoxy. Here is the link: 

http://www.westsystem.com/ss/assets/project-images/Project-PDFs-2/E...

Rojo

Permalink Reply by kenneth engledow on April 7, 2014 at 6:56pm

thank  you for the formula url.   i couldnt believe the answer i got from a Chuck at duckworks. i had sent a message there earlier for help on figure the amount needed and this chuck from there told me to go to the lumber yard and get some chaulking and smear on the leaks.  sheesh that was  a dumber answer then my neighbor gave me, which was to order some of that spray stuff they advertise on tv for spraying on a screen at the bottom of a boat to make it water tight.  sheesh i invested a lot of time, labor and money into this boat and i dont want it to look like a piece of crap when i take it out of the garage.

Permalink Reply by tungsten on April 8, 2014 at 6:21am

It may help if you can get your boat to sit side ways,put something like clear tape or sheet plastic on the backside of the knots so you can pour in some warmed epoxy.This will cure nice and level with the sides.If your painting then you could thicken the goo but I'd stay neat if you want a clear finish. 

Permalink Reply by John Ahlbin on April 8, 2014 at 7:10am

If you are up to the task, you could route out the offending cracks and fill the void with a wood patch like the patches in a sheet of DF plywood. You can be as creative as you like with the shape of the patch, circle,triangle, bow tie, square, football, fish or whatever.

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