Sealing up under new rear arch

[xpress]

Was just about to seal up the crease under the rear arch as it joins into the van, then i noticed that there are some gaps between the new rear arch panel and the inner arch of the van as it starts to slope down to the floor. Is it a vote for sealing all these up with seam sealer as the other side or could I leave these open to disperse moisture. What would you do?







update.. I am sealing it all up but would be interested to hear from anyone that's added drain holes here. what size mm drill bit etc

thanks.

[boatbuilder]

Seam sealer is the way to go, making sure it is rust-free and dry beforehand.