Seam sealant

[Curly2001]

I have an older 5th wheel that needs to have the seams sealed along the outside of the fiberglass where the plastic or outside metal trim is attached. What is a good sealer to use where the factory sealer is now falling out or dissolving? Would Dicor lap sealant be a good choice or should I use something else? I want to keep the new seam as narrow as possible.
Thanks,
Curly

[Curly2001]

Thanks very much!

[garym114]

Pro Flex RV Flexible Sealant
https://www.geocelusa.com/product/pro-flex-rv-flexible-sealant/

[MFL]

I like Dicor on my roof, and even though the Dicor lap sealant is a non-sag, I prefer Proflex on the sides. I use either clear or bright white, and often apply painters tape, if wanting a clean/narrow application. Proflex sets up quicker, can withstand rain in a short time, and in my experience is long lasting.

Jerry