Locating the leak source is difficult, but must be done successfully or any repairs are wasted money. I think the best leak detection method is http://www.rvleaks.com/
, it costs over $100, but well worth the expense IMO. I agree, removing ceiling panels and drying out any water soaked areas are a must. To leave it alone means mold and mildew problems are a reality.
If you know where leak sources are, Eternabond is the best remedy for flat surfaces, Dicor sealant is best for abuting surfaces or corners, they make both self-leveling and vertical application types to suit your need.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"