Got a few hours on the black girl this weekend. It was spent cleaning off the rear drivers side floor. This has had some repairs done to it and then had a rubberised coating put on it. This coating was quite sticky and needed to be removed so that I could locate any problems. To remove it I first sprayed some meths on and put a match to it, this softens the rubber enough to be able to scrape it off the remainder is then cleaned off with thinners and then finally all buffed off and cleaned up. I found a small bit of surface rust of which only a small hole had penetrated. I will fix this when I get the welder back. The rest was then coated with a good coat of hammerite. I have found that the meths system also works well on underseal as it burns at a lower temp and burns a bit slower than other chemicals. If trying this method only do a small section at a time so that you can work on the rubber while it is warm.