Mike,
spraying a sealer would not be my first choice, chances of get particle
airborne
increase by spraying, brushing on a sealer should work to hold the fibers
together.
alot of what EPA is recommending is coat it, mark it so no one disturbs it
and leave
it in place. you might close the curtains just in case on of them is peeking
in the window!

73
tt
ka9yzs