[snag n brag]

Here's how I've done it without any problems:

Seal, foil, epoxy, lightly sand, paint, epoxy topcoat.

If you don't epoxy over the foil you will see the seams when you paint. Also the epoxy wont reactivate the contact adhesive and cause the foil to lift like solvents will.

I've tried it just the way you described and tried to blend the edges of the foil in by sanding them but was still able to see them.