Rain Gutter Resealing?

[Cherry]

Help! I have a leak and I think it's because the rubber in my gutter finally gave up the ghost (the van is 25 years old) Does anyone know if this is some sort of gasket or what kind of sealant was used? Here's a pic of the interior of my gutters - the bit I'm talking about is the wide beige stripe. It looks like it's warping and it's almost directly over where the interior leak is when it rains. My van is a 1987 Ford e250 Starcraft camper with the high fiberglass top.

[markopolo]

Looks like a sealant in the photo. You should be able to tell - check other areas - a molding should be consistent in size but sealant would be wavy and the thickness would probably vary.

It would need to bond to paint and maybe fiberglass (if your high-top is unpainted). Surfaces would need to be really clean.
A Self-Leveling or Control Flow sealant would give a nice finished appearance and would easy to use. You don't have to spread them.

I've used Dicor Self-Leveling sealant on fiberglass but I'm not sure if it bonds to paint. Maybe call the manufacturer.
https://dicorproducts.com/catalog/roof- ... -sealants/

An RV repair shop should be able to recommend a sealant from the brands the stock