When you have a penetration that you have to seal, you want to use the FastFlash Gun Grade to keep air and water from leaking into that spot.
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Gun It
You run a bead of FastFlash gun grade around the penetration and use a chip brush, bondo knife, or caulking tool to spread the it out.
Tool it
You want a minimum one inch on the face of the subsubstrate and then if you can run minimum one inch on the through-penetration itself, whether that is a pipe or conduit that's running through the wall. You want to try to get at least one inch on both sides.
Don't forget nail and screw heads
Nail heads and screw heads need to be treated to keep air and water from leaking into the building envelope. The same is true for any deficiencies, wood knots, or any surface imperfections that may be subject to air/water leakage. You gun a bead of FastFlash gun grade onto the nail or screw head.
Then tool it out with a bondo spreader or chip brush.
Let it cure
So let's talk cure times. FastFlash uses STP technology which is a moisture cure technology. It likes heat and it likes humidity. The higher the humidity the quicker it'll cure. Most of the time in a high heat, high humidity area you can move on within about a half an hour. It will stay tacky to the touch but as long as it doesn't transfer onto your hand, you're ready to move.
Now that you know how to use Fast Flash and you've completed all of your detail work you're ready to move on to the air barrier.
