I prosealed and rivetted in my first tank rib three days ago and got pulled away before I could cover the shop heads with proseal. The proseal has now cured and I'm wondering if I can go back and still cover the shop heads, or if the opportunity has passed and I will never get a good seal by laying new proseal over the cured proseal (as scarce as it is around the rivets). It would be a lot easier to fix it now before the tank is fully sealed if I'm likely to have a leak later. Did I mess up? If so, should I drill out the rib and strip all proseal before redoing it?