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Old 06-18-2022, 01:02 AM   #21 (permalink)
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duckduckgo.com/?q=spray+insulation+with+vacuum+spheres&ia=web

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https://www.compositesworld.com › articles › microspheres-fillers-filled-with-possibilities
Microspheres: Fillers filled with possibilities - CompositesWorld
Spray drying produces discrete, uniform hollow spheres in sizes ranging from 5 µm to 50 µm in diameter. Significantly, the use of phenolic resin, which is naturally fire resistant, provides fabricators a nonhalogenated flame-resistant filler with far less mass than other flame-retardant fillers, such as alumina trihydrate (ATH).

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Old 11-15-2022, 12:21 AM   #22 (permalink)
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resurrecting this. i am trying to figure out the best products to use for the hood. my car keeps staying sooo cold
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Old 11-15-2022, 12:38 AM   #23 (permalink)
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Is it one piece, or two with an internal bracing gusset?
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Old 11-15-2022, 01:15 AM   #24 (permalink)
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Is it one piece, or two with an internal bracing gusset?
I believe two piece. I can take a pic in the morning tomorrow. It’s just bare metal
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Old 11-15-2022, 04:22 PM   #25 (permalink)
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I insulated the bare hood/bonnet of my retired Peugeot 106 with dense rubber foam, with aluminum coating. Reflects and insulates both heat and noise.
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[Old] Piwoslaw's Peugeot 307sw modding thread
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Old 11-19-2022, 08:57 PM   #26 (permalink)
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Here’s what my hood looks like. It’s thin barely metal with some holes and open cavities. No insulation or anything. How should I go about this?
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Old 11-19-2022, 09:38 PM   #27 (permalink)
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That looks like a worst case. With some internal bracing you might fish sheets of insulation in the gap.

It looks loke the best bet might be to take the hood off, turn it over, pour expanding foam in the cavity and scrape off the excess,
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Old 11-20-2022, 04:50 PM   #28 (permalink)
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Here’s what my hood looks like. It’s thin barely metal with some holes and open cavities. No insulation or anything. How should I go about this?
NOOO!!
You are hurting my eyes!!!
Images of naked hoods are disgusting
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[Old] Piwoslaw's Peugeot 307sw modding thread
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Old 11-20-2022, 06:38 PM   #29 (permalink)
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NOOO!!
You are hurting my eyes!!!
Images of naked hoods are disgusting
The premium models have a “ felt liner”
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Old 11-22-2022, 02:31 AM   #30 (permalink)
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I suppose you could ceramic coat the exterior to slow the rate of heat loss between use.
IIRC that was done to a single-cylinder 250cc air-cooled motorcycle engine by Yamaha. And that's a really good engine.

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