[VAL] Belly skin patching

["Al G." <waymark1@xxxxxxxx>]

Why should belly skin repairs require sealing? On trailers I have seen
pop rivets, not solid, are used to fasten the belly skin to the framing,
and sealing is used only where the wheels throw water and slop onto the
skin joints.
When using pop rivets, what does sealer in the rivet holes accomplish?
Prevent corrosion between the rivet and the sheet metal?
Al