I just used polar fleece, when I picked it up to put over the headliner board I thought it was a little thin, but it went on and came up great. For reference the original is very thin anyway.
The only thing I could suggest if your worried about it being too thin would be to give the headliner board a quick coat of paint in a similar/same colour as the material to ensure it doesn't show through a different colour. ie if your using black put on a coat of black. I would suggest a die, something that will stain the board rather than leave a cost of something else to peel off.
I was really suprised at how eazy the whole process has been (so far). Look forward to finishing it off tomorrow.
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