:( Uncured epoxy removal tips

I mixed a small batch of bad epoxy and now i have a semi cured patch on my boat that needs to be removed. its cured for 2 days and is jelly bean soft. bad times over an area of 3" x 16"

Are there any tricks for removing solid-but-soft epoxy? I have plenty of lacquer thinner, will that do anything besides provide fumes? I know epoxy is impervious to most things.

Other than lots of crappy scraping then sanding, are there any pro tips to remove semi cured epoxy?

Acetone