08-08-2020, 12:53 PM
The best way would be to pull out the window, clean off all of the old butyl tape then re-apply new butyl tape then re-attach the window. Easier solution is to use a polyurethane caulk like Dicor or other brands. Dicor makes a caulk that self levels and one that doesn't.
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
PO 1999 Foretravel 36'
1998 Newell 45' #486
1993 Newell 39' #337