If the skykight itself is cracked, you should replace it. If the caulk around it is failing, fix it with tape or Dicor like caulk. I have re-caulked mine since I might have to replace the skylight (again) and the tape is a nightmare to remove. I did tape my roof to the sidewall as I don't plan on removing my roof.
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2001 Winnebago Adventurer, 35U, W-20 8.1
F+R Trac bars, F+R sway bars, SafTsteer, F Sumo Springs, 4 Koni FSDs
2007 Forest River Lexington Ford E450 Chassis
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