Adding Sealant to Exterior Window Frames?

[Teamfour]

I always wondered why my window frames are not sealed all the way around on the outside. I am familiar with the installation technique and also do not have any leaks. Only the top of the frame has proflex sealant. Any reason not to complete the seal around the sides and bottom with more clear proflex as a preventative measure?

[westend]

Id suggest that you could seal the top and the sides but leave the bottom unsealed. In most RV window systems you could also seal the bottom since any water inside the glass and jamb should exit over the sill and out through weep holes. To be safe and old fashioned, leave the bottom unsealed. Any water that could leak inside the wall cavity should then have a path to the outside.

[gbopp]

Probably not sealing the sides and bottom will give any water a place to run off. If it was sealed, it could trap the water, possibly directing it inside the RV.