Gaco roof sealant vs...

Have a rubber roof on my Northstar truck camper, and I am looking to do some roof maintenance in a few weeks. This product "Gaco" sealant was mentioned in another post on rvnet, and it got me wondering if anyone has used it on a truck camper? At the minimum I was going to use Dicor to go over any cracks I have in the caulking but I have started to do more research and Gaco sounds like an interesting product. I have also heard Eternabond mentioned.

Whats your experience with Gaco roof sealant, and would you recommend it for a rubber roof on a truck camper? It looks like it just paints or rolls onto the roof covering all seams similar to a 'rhino' lined truck bed.

http://www.gacoretail.com/gacoroof.html