Argh! Dash cracked...

[Jim Wright]

Last night, I get in my car to drive home, and I see that my dash has
cracked, it's about an 8" long crack, very thin.  It hadn't been very
hot here yet so I hadn't been getting out my sun visor like I had in
years past...

Anyone know of a good product to restore the dash that won't cause
problems with a '91?  And is there anything that can really help fill
in the crack to where it isn't noticable?