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Old 11-12-2023, 11:15 PM   #1
Join Date: Jan 2020
Location: California
Posts: 110
Year: 1967
Coachwork: Gillig
Chassis: Chevrolet B-Series
Engine: 366 V-8
Sealing a compost toilet with fiberglass

Howdy folks,

I'm finishing up my composting toilet and a thought occurred to me about sealing it. The box is built out of cedar, with an industry-standard 5-gallon bucket waste bin and an elegant porcelain urine diverter that takes the liquids under the bus. A small computer fan will circulate fresh air into and out of the box, under the floor.

Anyhow, I realize that in the real world, there will be occasional splashes or times when the bucket chemistry isn't just right and a smell develops. I'm concerned about the wood absorbing these liquids and smells over time. I was going to urethane the inside of the box, like the rest of the cedar siding inside. But I am wondering if it would be better to fiberglass the inside of the box for a more complete seal?

I haven't worked with fiberglass before, but this seems fairly straight forward. Brush on the resin, lay the fiber mat, and brush with resin. Repeat for a few layers.

Looking for thoughts on this, as well as advice for laying the fiberglass.
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Old 11-13-2023, 07:52 AM   #2
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Seems like overkill to me, but if you're looking for a reason to work with fiberglass then hell, why not? If that's the case its worth pursuing, but I would think a few coats of poly would seal it up pretty thoroughly. Having said that, I think fiberglassing skills are nice to have.
That bathroom looks really great, I like how you separated the shower and toilet areas and made the cut out for the window.
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Old 11-13-2023, 11:48 AM   #3
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