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Boat Forum / Building / September 2007Surface Moistures and Epoxy
I am milling 16' lengths of western red cedar into strips for a jollyboat. This wood is fresh from the forest and is moist to touch. Can I have some opinions on what the surface moisture shld be before I epoxy and FG this stuff? Cheers, T. -- > I am milling 16' lengths of western red cedar into strips for a jollyboat. > This wood is fresh from the forest and is moist to touch. [quoted text clipped - 4 lines] > Cheers, T. > -- As a starting point? 12 to 15% >I am milling 16' lengths of western red cedar into strips for a jollyboat. >This wood is fresh from the forest and is moist to touch. [quoted text clipped - 6 lines] > > some epoxies can actually be mixed and applied underwater. Some can be applied to damp surfaces, others cannot. The real concern should not be the epoxy but rather the movement of the wood. Woods expand and contract with moisture, other things, including epoxy, expand and contract with temperature... paul oman progressive epoxy polymers inc www.epoxyproducts.com > I am milling 16' lengths of western red cedar into strips for a jollyboat. > This wood is fresh from the forest and is moist to touch. [quoted text clipped - 3 lines] > > Cheers, T. Talk to Gougeon. Lew Fortunately, the cedar will dry very quickly if if is cut into thin strips. A few weeks outdoors protected from rain should do it. Dave >I am milling 16' lengths of western red cedar into strips for a jollyboat. >This wood is fresh from the forest and is moist to touch. [quoted text clipped - 3 lines] > > Cheers, T. Thanks for the advice, guys! T. >I am milling 16' lengths of western red cedar into strips for a jollyboat. >This wood is fresh from the forest and is moist to touch. [quoted text clipped - 3 lines] > > Cheers, T. > Thanks for the advice, guys! > [quoted text clipped - 8 lines] > > Cheers, T. > > -- My advice. Bone dry. I recently built a canoe with Western Red Cedar and Teak strips. It was dry, or so I thought. I fiberglassed it and then laid on 10 coats of varnish over a period of several weeks. Each coat had dried for more than 24 hours, including the epoxy. Then I set it on the lawn for several hours where it was in the sun while I took some pictures of it. That afternoon I went to retrieve it and found hundreds of white, tiny, bubbles coming up through the well cured epoxy and glass. It looked like needlepoint as each of the little bubbles was evenly spaced by the grid of the glass cloth. ALL the bubbles were from the strips of Cedar. Apparently the Teak was too dense to hold moisture. |
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