I watched the car headlight one. I'm pretty sure it's not your fault it took longer than specified. The kit should've started with smaller grit numbers. They had you start with 2000, I FINISHED the sanding part with 2000 before the polish when I did my own headlamps on one of my cars. Though I didn't use a kit, I went to a parts store and just picked out the products I needed.

Also if you do need to do it again and want to get a kit again, some have drill attachments, making your life significantly easier. They're not expensive either.

Anyway, nice video. Hope you'll continue to make them, though on PeerTube I don't imagine you getting rich off it. I think having fun and populating the fediverse with content are good goals all on their own.