There were different recommendations from Palomino for my Solaire. What I found worked best for me is Kiwi Sealer. There are different brands but I found this to be the best. It used to be sold under the Scotch Guard Brand. I buy it a True Value Hardware stores. Their sealer doesn't work but this brand does.
Remember when you are camping to keep the ends open a little so there is adequate air flow from one end to the other. If you don't you will have condensation. I do this even if it is raining out. For my old pop-up Palomino recommended Scotch Guard and keeping the ends open a little.