We recently purchased a 2001 Safari Zanzibar. The caulking on the roof appears to be original, 14 years old! This Safari like most does not have a rear roof ladder. I did not inspect the roof, as I should have, prior to purchasing. Today I removed old caulk across the rear cap where it connects to the roof. It took me about three hours in the hot sun to remove old caulking about four inches wide by eight and a half feet across. I used Dicor self leveling roof caulk, best caulk ever used. My question is, do you need to remove all old caulk if no leaks? Can you clean old caulk well and put new caulk over, with a bead around the base of all roof attachments? There are roof vents, air conditioners, vent pipes, TV, radio and CB antennas, air horns, and solor panel mounted on this 38 foot roof. It will be a monster job to remove all old caulking. The roof is in good condition with no current leaks, thinking about prevention. I used citrus spray on old caulking, and scraped with putty knifes. Did not use heat gun, read mixed reviews, but sun was hot at 90+ degrees. Thanks for any experiences.