I bought a used copy of the MFSL CD of Steely Dan's "Aja" with all this green felt tip pen gunk round the edges of the disc.
Still prefer the old regular CD from 1985, which is free from green magic marker graffiti
I remember this 'treatment', all the positive reviews, with the bye line that it stopped laser reflections from the edge of the disc being reflected back into the disc and interfering with the reading of it. But, total internal reflection occurs on the inner surface of a boundary not the outer one where the expensive green gunk was applied so it couldn't stop it!