Homestrip (available from Toolstation) is far and away the best paint stripper I've ever used. I urge you to give it a try. I've shifted all sorts of horrid super thick old paint with it... from 300 years worth of finishes on doors and beams in our house - through the 1970's grey paint on a Lenco turntable - to the paint and underseal on the sills of our Citroen C3.
It's available from Toolstation.
https://www.toolstation.com/home-str...remover/p70267
This stuff, like other modern strippers, takes a little while but crikey - be patient! It's not as if restoring an old radio is a speedy job!!!!!
Safe to use, kind to the environment and not harmful to your skin.
Steve.