Roof coat before or after

I personally have never used any tape on the roof seams of all my coaches. On our last coach, a '99 Fleetwood Bounder 34V with a rubber roof, it too had all the white worn or, deteriorated off so, I did a complete "Dicor" roof re-coat which, took all of one day. Then, I re-sealed any and all vents and seams with the Dicor self leveling sealant. It looked just like factory when I was done.

I like using the sealant because, if and when I ever had to remove it for any reason, I understand removing that tape is a pain in the butt. But, removing the sealant, is cake. I've done that.
Scott