OP...Not sure if you know or not but your brand has one of the best reference data bases available in RV industry. I even use some of their info on my old retired x-rental Cruise America. Reason is the color and types of material they use matches real good with mine.
My experience with "NuFlex" is that they shelf life about 1 year with un-opened tubes, so don't stock up what you can't use within a year.
Here is your info Minnie Winnie 31H
http://www.winnebagoind.com/diagram/Sealant/184022a3.pdfI wouldn't use anything not listed. Just me and the way I do things. I've good results following what they recommend.
Hope this helps.