Seal rubber roof

[joe1047]

Hello to all. Need some opinions on coating my rubber roof on my 2014 montana. No problem with the roof, I wash it 3 times a year. And it is good shape. I see the coating you can buy by the gallon from camping world. Do you think it's a good idea to coat the roof, or leave it alone.
Has anyone put it on there trailer, and how long did it last, was it cracking or peeling? Also should it be inside when you do the job in case it rains?any help would be appreciated. Thank you.