It depends how much you care about tidiness/perfection. Unless you use a metal paste, the worst that can happen with too large amount is that it will leak outsi

It depends how much you care about tidiness/perfection. Unless you use a metal paste, the worst that can happen with too large amount is that it will leak outside. And you can wipe that - that's it. So feel free to use too much and just clean up afterwards. That's better than using too little.