# Laminate cavities in a board
**URL:** https://foil.zone/t/laminate-cavities-in-a-board/27003
**Category:** Build, Repair & Mod
**Created:** [August 14, 2026, 9:07am UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003 "2026-08-14T09:07:18Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [August 14, 2026, 9:07am UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/1 "2026-08-14T09:07:19Z")
Anyone got best practices to laminate large box sized cavities in foam without too many extra steps?
Last time I first hand laminated the interior.
Was not great and also takes too long.
Current idea is to fill it out with dry chickpeas or something, like when baking a pie and then do regular vacuum.
But if anyone has a good workflow, I would love a better idea.
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 14, 2026, 9:47am UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/2 "2026-08-14T09:47:55Z")
Are you talking about laminating the battery cavity in a board?
The method all the manufacturers use is to use a reverse mold. That way the finish of the box perfect and doesn’t require post touch up…
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### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [August 14, 2026, 2:36pm UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/3 "2026-08-14T14:36:46Z")
> [@Jezza](#):
>
> Are you talking about laminating the battery cavity in a board?
Yes
It’s for a one off, so mold is probably too much trouble.
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### Author:  [@JasminRM](https://foil.zone/u/JasminRM)
#### Post date: [August 14, 2026, 2:53pm UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/4 "2026-08-14T14:53:25Z")
Hi,
See if this concept works for you. A separate pod made of prepreg carbon to insert in the board, where the battery case is inserted.
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### Author:  [@Jezza](https://foil.zone/u/Jezza)
#### Post date: [August 14, 2026, 2:58pm UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/5 "2026-08-14T14:58:19Z")
> [@Jan12](#):
>
> It’s for a one off, so mold is probably too much trouble.
Yeah the ceapest is to just vac bag down. An alternatice to get a good finish on the base is to vac back a piece of polycarbonate down. I did this on one board and then you get a nice smooth base. I didn’t care about the sides being rough.
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### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [August 14, 2026, 5:27pm UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/6 "2026-08-14T17:27:17Z")
> [@JasminRM](#):
>
> See if this concept works for you
Looks like a piece of art.
Wish I could justify doing it that way.
Reality is, its just another idea thats likely not going to work half as good as I think it would.
So for now I just need a way to get the fibres to the wall without too many extra steps. Would love to do just a two step procedure, Top + Bottom, without any intermediate steps for the cavity.
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### Author:  [@Joka](https://foil.zone/u/Joka)
#### Post date: [August 14, 2026, 10:10pm UTC](https://foil.zone/t/laminate-cavities-in-a-board/27003/7 "2026-08-14T22:10:22Z")
I build a box with several pieces
, Ilaminated each piece with poor man’s vacuum and glued them together later.
Then put them inside my board