You might not believe this, but try hairgel. (Score 0)

Yes, hairgel. It's clear, allowing the laser light to pass thru mainly unaltered. It fills in cracks nicely, reducing potentials for skips. And, in case the logic is not enough to convince You, I remember reading a comparison of different home remedies and commercial products for disk repair. Although, I do not recall the exact source. The Researchers thru in hair gel just for 'sh**s and giggles'. Turns out, They found Themselves saying, "No sh**!" and enjoying lots of giggles.