i have a fiberglass headliner i am trying to get the foam off of. any ideas? anyone got any pictures of custom headliners?

 

In most cases the foam is pretty worn out and that's why the fabric hangs down.
If that is the case, simply brushing it with your hand typically knocks it down a bit.
However it is faster to use a stiff brush, either made from nylon or a fine brass/steel that will flex easy.
I am currently working threw my own headliner, and this is what I have done.
You do have to watch out a bit as if your using a brush, the brush will take some of the fiberglass head liner with it.
In my case this was not to much a concern as I have reinforced the headliner after with fiberglass cloth and resin.

 

sorry, I have the plastic headliner. I just wanna spray it with rubber undercoating when im done. there isnt any cleaner that will strip all the foam and glue off?

 

Bo experience with that off hand, but I have not seen much adhesive that would hold up well to a heat gun.
I think I would use the heat gun to strip away the foam, followed up with a adhesive remover like Goop. That should get the surface pretty clean