Last night I could only reach two locations of the cowl joint, but it was enough to hold the cowl halves together. My glassing last night was sloppy (first try). Tonight was better, but I had much better access with the cowl off.
So tonight I took the cowl off and finished all of the glassing of the straight joints.
The tight curves of the area below the prop hub are next, and those will be difficult due to the tension in one half of the cowl.