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Originally Posted by Quickstep192
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This. Well, kinda. I use one of those fine line paint pens like Tim suggested, not a brush.
A couple other things I wouldn't do, especially on the Ferrari with its soft paint on which he's doing this, is that the initial wet sanding is redundant and is adding an unnecessary sanding step, further thinning the clear coat. The raised lip in the paint at the chip from the impact will get levelled in the wet sanding process after the touch up has cured.
However, some sanding to prep the chip and provide some mechanical grip for the touch up paint might be useful. A very small piece, like a little round circle from a hole punched piece of sand paper should be sufficient, maybe stick it to the eraser end of a pencil to sand. I haven't found this necessary, just a good cleaning with lacquer thinner or isopropyl alcohol should suffice. Unless the chip is rather large, in which case, I'd sand it a bit.
As well, his second layer of touch up paint, the clear, will likely get sanded away unless the layers are VERY thin, which just won't happen using a brush. Perhaps one of those paint pens might apply it thin enough, but I can't get them to lay the paint down thin enough and still cover.
Another thing that guy said is just plain wrong. Wet sanding vs dry, using the same grit of paper is actually MORE aggressive. It doesn't "tone down the sand paper's aggression". Dry paper will load up with paint when sanding and then become less effective, while the water in wet sanding will clean out the paper and allow it to actually bite.
I've filled rock chips and then wet sanded and polished and many of them are indistinguishable from the surrounding paint. And I mean in the 'can't find it even though I know there was one right there a few days ago' kinda way.