Hopefully no one tried to coat with epoxy
prior to coveirng with Cetol. Otherwise if you want to get to bare wood you will have to do quite a bit of sanding.
We use heat gun. Its like any other type of paint, heat will soften and then use scrapper to sluff off. You will be surprised how fast you can remove after you get a system down. The chemicals are very messy and they just don't seam to do as good of job. Not sure if you have a topcoat paint if heat will effect that. Maybe someone else has experience with that.