I don't have a Rampage top, I have a Softopper. They sent some seam sealer with the top. You should be able to buy it at any decent outdoor shop (Bass Pro, Cabela's, Gander Mountain, etc). Mine leaks if it's a long, slow rain and water has a chance to collect. I'll be pulling it off next week and resealing the seams.
Send me a PM and I'll get the brand name when I get home from work.