Proper repair for this longboard rail ding?

I was thinking rattle can.

But I have seen oil-based exterior paints. Kilz (sp?) used to seal paneling is oil-based (granted it is a primer).

Cabosil and Milled fiber are problematic for fillers when doing ding repair. Cabosil sands like $#!t and is meant to be used as a thickener not a filler. Milled Fiber not applied properly traps air and also sands poorly, gums up sanding disks. Which results in added filling and more sanding. Q-cell is the best filler to use on a ding of this type and size. It can be thickened to a putty and if done so properly will not sag. It sands better than any of the other fillers and is the “go to” in ding repair shops.

kilz is what I classify as a primer. I can’t imagine anyone painting a house with “rattle cans”.

Agreed.
But as I said, I was also thinking oil-based “exterior house paint.”

I am in California. I recently purchased a quart of oil based enamel. It was a big deal. I went to several different paint stores before I found one that carried it, then they sent me across town to a separate outlet of theirs because it wasn’t available in that one. When I got there I had to answer questions like what do you plan to do with it, what are you painting, have you ever served in the military, bla bla bla. Like I was buying an assault weapon or something. Definitely weird. But for furniture, and doors, I am old school, I prefer oil based.

Which is weird. They act like its an evironmental issue, but the shelves are packed with spray paint enamel, all of it oil based.

Another weird thing: I picked up a can of paint thinner off the shelf at Lowes, when I went to check out they looked at me very suspicious, very hostile, and told me that it was not for sale. I swear they acted like they were going to call the cops or something. I asked why, and they wouldn’t tell me.

In my area, you can buy oil-based house paint at Lowe’s and Home Depot. One of the two used 2 sell Xylene in large cans (don’t know if they still do.)