that was recently discussed someplace here - fill it with paintable flexible seam sealer and 'trowel' it concave so it's not visible from above or straight on, paint over it
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics