If all the bolts are out (there's a tricky one at the back that has been known to throw Jeep owners for a loop), then it's likely just glued down from the silicone. Be careful when prying, don't pry too much in any one place or you might chip the aluminum. Go around it a little at a time. If you want to use a hammer, try putting a block of wood between the hammer and the cover to spread out the impact. You might be able to go around with a utility knife to help cut a little bit of the seal, but I'm not sure if I'm remembering the Jeep cover or another rig. :dunno: