You cannot spray the outside perimeter nor do roofs void dusting. Basically you need to target the chemical to the areas inside that could be harbouring cockroaches. An effective and safe approach is to use bait gel. Bait gel is applied in dabs inside cupboards and other nooks and crannies of a boat. The cockies soon detected the gel and readily eat it. They soon die and their carcasses are then eaten by the remaining population. It can have a “cascade” affect and eliminate the cockroach population on the boat in a matter of days.
If you have a challenging pest problem, be it a boat or your home, call us now for a solution.