AFAIK Home made concoctions of any pesticide in your hive is illegal if you are keeping bees for the sale of honey(food products). You also leave yourself open to the possibility of damages claims (own a house, well maybe you won't for long).
While frontline may have one of the same active ingredients in it, it is not approved for use in beehives. Why, it would also contain other ingredients and the delivery method of the chemical is not controlled so contamination of honey is a real possibility. If you want to eat your toast in the morning with a spray of Bagon on it, go for it, but don't give it to anyone else.