I recently had my 240 shell done by a local "Green Earth" glass slurry. The results were fantastic! The cleanup was a real chore. It took me three days to get the glass out of the car. I don't mean the occasional wisp of powder I mean the five pound clumps. It was worth it, but it was a real chore, a lot of rotating on the rotisserie a lot of tapping, banging, vacuuming, and blowing. If I had done only the exterior the cleanup would have been a breeze. I did everything inside and out. Probably should have just POR 15'd the interior but I am just a little anal when it comes to rust. The job was done on a hot humid day and the skin did start to flash almost immediately. I spent two days with a DA smoothing the body and then shot on epoxy primer sealer inside and out. Painted the shell on my rotisserie which made good coverage a breeze. Plan on sanding the body the glass will leave a rough surface. The inside and the underside got a quick scuff and liberal scrub with wax and grease remover.