I used the ProFlex to caulk every conceivable spot I could find that moisture might get in where it shouldn't.
Where the slide seals meet the camper side, especially the leading edges, could let a lot of water seep through when driving in the rain.
I also removed the vents to the propane tank storage lockers, as the holes are just cut through the wall, exposing the luan to the elements. Prime spot for the start of delamination!
Also tidied up the bottom of the fridge vent access panel hole, and put a complete new layer of ProFlex over the obviously cheap crap the factory used. Problems there have definitely caused wall delamination.
However, I didn't wait for the caulk to 'set up' before removing the masking tape. Seemed to work fine pulling it off with the caulk still wet.