Bondo to the rescue. Another first. I had a couple
of proper trowels, but found the hacked-off chunk of
ice cream pail more effective in general,
(more flexible, easy to shape).
Still, the bondo is just to fill in roughly, the smooth
blend comes from sanding. I've decided I'm not one
for bodywork...not enough patience. I sprayed primer
to confirm my blending on each bondo job. If it wasn't
up to snuff I'd sand some more. Although none of
them were really up to snuff, but they all qualified
as "good enough for matte black". Or at least
"not distracting to look at like the raw weld".