This depends on the epoxy and the construction. For example, surfboards and snowboards are quite flexible and should have long lifecycles before cracks make them leak and less useful. making a surfboard out of table top epoxy will be a disaster
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@Baxter it works.
Basically thatās what Iām doing for two years.
Even without the cf sheets in between the tubes it has nice rigidity to it.
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I use the best epoxies and cyanate esters on earth at work and have for >35 years. Cost is basically no object. They all microcrack. We thermal cycle parts right after we build them to induce the micracracking before testing because it will be there when they launch. If you want water resistant cyanate esters are a better choice but not perfect.
I also own 9 surfboards. I kept every board I ever bought and didnāt break. The yellowing comes from UV, which epoxy and foam are also susceptible to.
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Nice. Working with resin can be intense. Before this I was learning to make spearguns, made surfboards before that. There was a guy in the spearfishing world that had similar experience and cooked up a custom flavor of epoxy for laminating spearguns, and it was incredible for that use compared to other epoxies for other purposes. I (and others) would love to have a esk8 specific epoxy, even though we can get along with what we can get now. Would better materials make a difference at all for this type of work? In my experience making surfboards and spearguns the right epoxy is essential to the work. 
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What about wrapping all the parts with heat shrink then flooding the whole enclosure with silicone? It would bind to the wires, and should resist vibrations and flex better than epoxy. If you ever need the parts to replace or upgrade you can cut and peel the parts back out in a few hours
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Oceanographic instruments are sometimes packed in silicone grease to make them impervious to saltwater and pressure. The āhardeningā type of silicone will make it difficult to dig in and fix stuff, methinks
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Thanks you all your replies, it seemed that I exceeded the comment limit yesterday. Iāll be working on a deck large enough and āwater resistantā
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Was this ever made? I have a 10S6P flat pack here
That deck would also fit a 15S4P flat pack for some of the new ESCs coming out
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Unfortunately not 
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If it still is being made, just make it fit a 12s4p of 21700 cells ā shorter length, more capacity.
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or 10S5P because that will also fit 12S4P or 16S3P 
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