I replaced the Eternabond tape on the top of my slide out a year or so ago and it's starting to peel a bit on the edge. When I get back from my next trip I'll try the small bead of Geocel Pro-Flex on the edge and see if that solves the problem.
I bought my small roll of Eternabond from Amazon I think. No need to get raked over the coals by your dealer.
Funny how dealers think that if you can afford an RV you can afford to pay double the reasonable price for parts and accessories.
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.