Congratulations and welcome.
Don't know if the sealer works or not but sun damage to RV's is a real thing.
When in storage we keep all the windows covered and over winter the entire RV is covered.
We had a 5th wheel for 10 years: UV faded the outside, faded all the wallpaper inside, destroyed the decals, and turned all the vents brittle (a hailstorm then destroyed them--replaced them all with fantastic fans).
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