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Originally Posted by Locke N Load
What about these for a plan?.
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Your plan sounds good, Just a few thoughts....
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Deck - Carbon-core plastic honeycomb for the core and 1700 with poly for the lamination. Final layer of 1708 and epoxy to bond to the hull sides and sanding/fairing and use epoxy putty for adhering to the stringers.
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Sounds good, you can also just buy cabosil and thicken the epoxy resin to make your own putty. That will be cheaper plus you can make it as thick as you would like. The premade stuff is nice as well but have always made my own.
When fairing there are two different ways I normally fair out epoxy coated surfaces. 1) If using all 1700 with a skim coat of fairing compound. 2) Using 1700 with the last layer of 1708 csm side up and fairing into the csm side itself. Both ways keep from sanding directly on 1700 fibers so I dont cut threw them.
It is super hard to sand or fair the csm side of 1708. It will gum up the sand paper badly. Me I don't like using a lot of fair compound to skim out an entire surface so I use the 1708 but do still use small amounts touching up low spots. Using a lot of fairing compound to me is like using bondo on a car. I keep it to a minimum but nothing wrong with the stuff if used correctly.
Also you can buy micorballoons or something like west systems microlite 410 to add to the resin to make the epoxy easier to sand. Lots of people do use just 1700 then do a 1/8th to a 1/16th thick of fairing compound and then block sand most of it back off to get a smooth surface. Either way will get good results and keep the 17 oz fibers strong and undamaged.
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Bracket - Female mold coated with gelcoat then a layer of CSM and then 1700 and poly with Coosa board for a core. Lots of layers of 1700 and poly on both sides of the Coosa..
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You may want a few more layers of CMS behind the gel coat due to you can get "print threw" from the biax pattern if you don't have enough between them. I normally do 2-3 layers of csm then add the 1708 csm side down to make a good barrier to prevent the biax pattern from showing up in the outside gel surface.
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All holes in the hull filled in will be 1700/epoxy..
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Far as small holes that are non structural I like both epoxy and VE resin. They both will work fine when bonding to the old glass. Me personally I like to use VE due to it will set fast, the glass don't sag if flashed well, it sands easier, hardens fast enough I can scuff and add more layers in 30 minutes if needed. Epoxy will work great but it takes much longer to cure especially if you need several more layers. It dose not seem to blend as well and sands like crap.
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Sound reasonable? 1700 and poly for making parts with 1708 and epoxy as a final layer to bond them to the hull and so the CSM layer can be sanded into where needed. No 1708 for structural applications. Is one layer of 1708 enough to secure the deck to the hull sides? Maybe a strip layer along the seam then a full layer over the whole deck connection point?
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Bonding the deck and parts to each other will need several layers of fillets. I would use a curved object to drag putty in the corner to make a base to lay the cloth on. Then I would cut several strips from 2" wide to 4" to 6" and 8" to lap on top of one another to build up a nice curve between the deck and the liner. Same thing between the stringers and the deck. There are some good post on here about tabbing and fillets.