Engrave epoxy coated aluminum

I’m very new to this. I would like to etch/engrave serial numbers on epoxy coated aluminum. I’m having trouble finding an inexpensive machine that will do this. I’ve used the Sain Smart 3018 pro to get familiar with this technology but it doesn’t have enough power I believe. The factory uses a Epilog Zing laser engraver but it’s way out of my price range. Any suggestions would be appreciated.

Thanks!