Unlike David T, I am all for removing the T-molding, filling with acrylic caulk, and painting
all of the Ensolite interior. We did that with our 1978 Trillium
4500, and MUCH prefer that to trying to maintain the T-molding.
Here is the video I did to explain how I did it:
Of course, if you want to maintain the trailer in as original shape as possible, replacing or repainting just the T-molding is always an option. Just not one I would go with.