By Jim Twamley
Look around the RV park and you’ll see examples of UV radiation damage. Window frames, vents and corner pieces that have yellowed are abundant. These items are still serviceable, but they will eventually become brittle and crack, allowing moisture into your RV.
You can purchase new frames and vents (they are inexpensive parts), or you can remove them, give them a good cleaning, then spray paint them — they will look as good as new. You should also clean off the old caulking and reapply fresh caulking at this time.
If you choose to replace them with new parts, I would still paint them with a high-quality paint before replacing them. Paint will stand up better to UV radiation than the PVC-type material these are made from.