POR-15 sells a brush on clear that’s made for preserving cardboard and similar materials. I am considering purchasing some to topcoat and preserve the cardboard sun visors on my ‘64 Tempest along with the molded cardboard glovebox on my ‘57 VW.
You might be able to use it on your headliner board to add a bit of strength and keep it from crumbling.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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