To be honest but with respect to Welsh D, Jewelers Rouge is more of an old wifes tale than an effective repair poultice.
Fullers earth is perhaps about the same and not really effective on flat glass!
I purchased this kit several years ago and have had successful repairs from it, some of which you could run your finger nail along. But be cautious as it does take a bit of mastering and no as simple to use as the manufacturer suggests!
Now! I did quite a bit of research into this and I am quite happy to share it with you. The polishing machine contained in the kit is a wet flex water fed grinder and basically the whole system works a bit like the Mirka system except it is drip fed with water from a pressurised container, obviously to keep the surface of the glass cool as to not cause distortion. The discs are similar to abranet but are actually 3M Trizact polishing discs and are graded buy colour not size of grit. The polishing machines can be purchased for around £200 from Marble and granite tool supplies and the preesured pot is one of those pump up garden sprayer’s.
Finally, you would need a poultice or liquid compound polish to bring back the clarity of the glass: Cerium oxide is used widley in the glass polishing industry to create bevelled/polished edges and is easily obtained.
Places like screwfix and machine mart also do basic glass polishing kits but how effective they are, I dont know!
Hope this helps regards Russ (Prime Decoration)