Roof and gutter treatment

[morganism]

This looks pretty promising

2300® VEHICLE BODY SEALANT

https://www.geocelusa.com/product/2300-vehicle-body-sealant/

and for the lower sections that have rotted

Clear Geocel GeoBond Instant Vehicle Roof Repair Kit

https://www.amazon.com/Geocel-GeoBo...srs=3277659011&ie=UTF8&qid=1549064686&sr=8-84

 

[Splangy]

Promising for what?