ChuckG said:
Even if you remove the screws and/or pop rivets, the holes will come back to haunt you again and again. You'll have a line of pock marks, and that's a dead give-away for a replaced quarter panel. Just ask the guys with sharks who try to fill the holes for their luggage racks.

Chuck
Has your bond adhisive dried?
? did you use a 2 part epoxy
If so you will probably need to undercut it some.
Then top coat with another type of filler.
As for the screws, after they are removed.
Two ways to repair but no guarantee,, shrinkage is the problem.
Open the screw hole up to about a 1/4 inch
bevel the top area (countersink).
You will need to buy smc panel adhisive sold in qt. , cures out very hard.
Make sure you mix the can resin will be on top.
Fill hole packing it as you go.
Let cure for 48 hours then sand slightly undercut.
Apply another thin fill over repair. You can use smc but it is much harder
than the fiberglass. Little harder to feather it out or use a good body filler such as Rage.
Open up screw hole use smc but add fiberglass mat cut no larger 1/8 inch
and strands pulled apart. Add this to smc before adding your hardner mix then
add hardner. Fill and pack wait 48 hrs at least.. Then apply another light fill
do not use mat in this.
Or go just with fiberglass mat but you can get into more trouble.
Then block and hopfully your ready to prime.
Don't forget to give your primer plenty of time to cure also.
The whole secret is letting things cure if you can wait longer than 48 hours great let set for a week.
If you like email me and i will send my phone #
Good Luck
jckans