Spray the outside.
We didn't pre-season and let mother nature do it for us during our first outing and did get some water. Just got back from second trip where we had torrential rainstorm the first night. Not a drop got inside.
2015 Shamrock 231KSS, Oyster shell
2016 Chev Silverado LT Z71 Ext. Cab, 4x4, 5.3L V/8
Reese Straight Line WDH, 2000W Honda Gen.
2 Old Town kayaks & 2 Boston Terriers - Zoey/Gonzo
Lar & Ruth
55 nights camping in 2015, 45 in 2016