Headliner question

[kwin]

I am in the process of re-doing the interior on my 1991 suburban, new seats , leather covers, new carpet , painted all the trim. I am about to bring my headliner to my upholsterer to be recovered.
He asked me to strip off the fabric and foam, it wouwld be easy because the glue dries out and they practically fall off.
Not likely it's not wanting to come off , the fabric came off and left a surface too rough to attach the new fabric to.
How do I remove the foam with out destroying the headliner board?

Thanks

Keith
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