Step 6- In colder climates you may want to pre-heat the butyl to soften it some. After pre-heating, with heat gun on the warm setting, line up the bolts with the holes and press the hardware firmly onto the deck. I will often stand on the fitting, if possible, to partially displace and seat the butyl.
For illustrative purposes clear polycarbonate was used in place of a deck, another Compass Marine first, but don't worry one of the magazines will surely rip this idea off in no time. (Wink).
This photo allows you to see what actually happens when you bed with butyl.