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My dad and i do some automotive stuff on the side, so I have access to automotive clearcoat which is what I use if I need to seal stuff (it's shiny though, so probably not what you're looking for).
This would probably be bloody overkill, but I'd recommend going down to the local hardware store and asking for a clear matte sealant. If they ask what you're using it for just say you have a craft project and want to keep the paint fresh or something like that. If it's good enough for hardwood floors or auto paint it's darn well good enough for a 40k terrain piece. It shouldn't run you too much, relatively speaking since this hobby stuff is so expensive.
There's my contribution. If there's something more suited to the hobby and doesn't come in gallon jugs I'd like to hear about it.
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