Cover it with a tarp to keep it from sustaining sun or water.
How to seal siding from water.
Use a caulking gun to apply a continuous bead of silicone sealant along the vertical seams between the vinyl j channels and the exterior window casings.
Set up your saw horses about 6 feet apart in a shady area.
The temperature should be be no colder.
Lay the siding out on sawhorses or on a horizontal surface to make applying the sealer easier.
Lp recommends applying primer the foundation of the house before painting the siding to prevent moisture from wicking into the siding.
Check to be sure weep holes are open along bottom of window openings.
Choose a calm temperate day to seal wood.
Since water runs downward unless it s being driven by strong winds the standard method for creating water resistant vinyl cladding is to start at the bottom and work up.
Stack your new siding on top of some scrap wood on a level place in the yard.
Using a standard sized roller instead of a short roller speeds the process of applying the sealer.
Inspect the area above the leak including both indoors and out.