What are folks using for "smiley" filler

[gbitzer]

I've had 20 years of good luck using 3M™ Urethane Seam Sealer to fill overlapping panel lines and even hid hard rivets on my RV-6. This stuff is easy to use, doesn't shrink and remains flexible. Can be thinned and blended using reducers. Available at most auto body paint stores. It's very paintable after curing.

[MarkW]

I can't believe you would cover a memory like that.
I use a sharpie to write the name of the person that was bucking during that session. On the inside of coarse.

[Bandera]

I don’t know how many times I’ve heard “Can you do something about those? My wife was helping me rivet that day”. Yes sir, sure can. Lol