Update for all your amusement and scorn at my travesty towards ding repair.
Finally got around to this and yeah, I remembered Bondo looking like whiskey puke but, still, that first pour into the mixing cup was a holy sh!t that's the leavings from the Big Ball of Brown moment. Think it was worth 4-5 ounces of the Bondo and another ounce or two of Q-Cell
And picture below is obviously (still) after. I was way too enthusiastic in making sure it got everything covered so that left me a lot of sanding and probably still could use some more just to flatten things out a bit. But hey, feels pretty solid and whole area will be covered by dirty wax anyways. Good to have that backup stepup board in the mix if/when that 6'7" snaps.
I will also add that Bondo is so much less temperamental than standard ding repair resin/catalyst when it comes to setting, bubbling, etc. Would definitely use again for larger ding repairs.
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One thing for sure, I want to be the one who does SouthCoastSurfer's next ding repair.