To seal or not to seal?

["James Lea" <clocks@midcoast.com>]

At the bottom front of the rear wheel arches on my BT7 there is a slot between
the outer fender and the inner body panel that looks like it was designed to
catch debris. As of now it is clean but I am wondering if it should be sealed
with black body sealer and painted or left open to the air so it can dry? If
it is left open there is no way to keep stuff from collecting in there and
causing moisture to stand. Thanks for any advice. cheers, JL

James Lea
Rockport Maine
1962 BT7 II