Good durable paint for Frame

[Timber]

Hey guys, painting a little Sportster frame and looking for a good durable paint. I have no desire to powder coat. I've painted a bunch of tins but it's been a few years since I've painted a frame. Was hoping there is some better paint options than years ago. Any advice is greatly appreciated! Thanks.

 

[JCCLARK]

I would use a good urethane.
It's what I use on boats and trailers.
You can even clear coat it if you like.