I haven't done this on my Porsche, but on other makes.
On new felt I saturate it with silicone spray, the kind that goes on wet, then dries leaving a dry film. And keep it indoors away from the dust until it dries.
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
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