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Boat Forum / Building / July 2008Apply Epoxy to the Cuts in Scored Core Material
I want to know the proper way to apply epoxy on scored core material. Scored core material has many cuts on both sides to allow it to be bent slightly. I am under the impression that I need to apply epoxy inside the cuts. The method that I have come across in web site is to lay the scored core material on a piece of 10" PVC pipe to expose the cuts; then we can apply epoxy into the cuts. This sounds good. I cut a 5-gal bucket in half (that is around 10" diameter), and layed the scored core material (Corecell) on top of it. But I found that the cuts were not opened that much, and I had a problem getting epoxy into the cuts. I could only manage to get the epoxy only half way into the cuts. I ended up opening the cuts by hand; but this would easily cause the core material to get separated along the cuts, and this was not convenient. My questions are: o Is 10" diameter pipe too wide? Which size do you recommend? o Do I need to use very thin penetrating epxoy instead of thickening it? I thought I am supposed to thicken it first before adding it to the cuts. o Is applying epoxy to 1/2 depth of a cut good enough? Do I need to apply epoxy to the full depth of the cut? Thanks in advance for any help. Jay Chan I do not know what you try to do, but base on my experience the gaps supposed to hallow/empty. What is my experience ? I built 38ft sailboat Spray. I use corecell as a sandwich construction. The idea was to keep sandwich as light as possible. After corecell was installed I used very light putty – to fill gaps only on the top. Next was sanding and on the top fibreglass with resin. In short – do not fill the gaps with resin. I hope it helps. Mada On Jun 13, 8:19 pm, aszczurow...@hotmail.com wrote: > I do not know what you try to do, but base on my experience the gaps > supposed to hallow/empty. What is my experience ? I built 38ft [quoted text clipped - 6 lines] > I hope it helps. > Mada I was referring to an article: http://www.boatbuilding.net/article.pl?sid=06/01/24/1330205 It said to put scored balse core material on top of a 10" PVC tube to open the cuts and then apply epoxy mixture into the cuts. Now, I re-read the article, and I find that he used 3/4" core, and I am using 3/8" core. This means his is double the thickness of mine. I think this explains why his core can open up using a 10" PVC tube, and mine cannot. I probably needs to put the 3/8" core in a smaller diameter pipe than 10" if I want to apply epoxy inside the cuts (may be 6" pipe). Having said this, seem like you don't need to apply epoxy into the cuts and your boat is doing just fine. I guess applying epoxy into the cuts may be a "belt and suspender" kind of thing. Thanks for pointing out a different approach. Jay Chan > On Jun 13, 8:19 pm, aszczurow...@hotmail.com wrote: > [quoted text clipped - 28 lines] > > Jay Chan Epoxy resin - by itself - is hardly ever used thie way. It's too heavy and too brittle. It is almost always used with a filler added. Microballons were suggested. For foam fillets, that's probably fine. For more structural needs, cotton is often used. It sounds to me like you need to do some homework first. Get the to thy library, or Amazon and learn the basics. For what it's worth, Richard > > On Jun 13, 8:19 pm, aszczurow...@hotmail.com wrote: > [quoted text clipped - 44 lines] > > - Show quoted text - No, I am not talking about using epoxy to fill in big gaps or fairing. I am talking about filling in the grid pattern cuts in scored core material. Some core materials are scored in order for people to easily bend it to match the curve shape of the surface. I was not sure if I need to fill in the cuts. Seem like I don't need to fill in the cuts as long as I am using man-made material as core instead of using balsa core. Jay Chan On Jun 13, 8:19 pm, aszczurow...@hotmail.com wrote: > I do not know what you try to do, but base on my experience the gaps > supposed to hallow/empty. What is my experience ? I built 38ft [quoted text clipped - 6 lines] > I hope it helps. > Mada I read that article one more time, and I think you are right to say that we don't need to apply epoxy mixture into the cuts of a scored Corecell core material. The author of that article said that he needed to apply epoxy mixture into the cuts because he was using balsa core (that can rot); by filling the cuts in a balsa core, he can prevent water from easily spreading from one area of the balsa core to the next area just in case water finds its way into the core. Seem like this is not an issue with core made from man-made material such as Corecell. Good, this means I can skip this step. Thanks for the suggestion. Jay Chan Hi when applying epoxy to penetrate an material I always thin it with Acetone which carries the epoxy into the material. The second coat use normal mix epoxy, works for me. Sal >I want to know the proper way to apply epoxy on scored core material. > Scored core material has many cuts on both sides to allow it to be [quoted text clipped - 25 lines] > > Jay Chan |
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